diff --git a/xml/System.Net.Http/HeaderEncodingSelector`1.xml b/xml/System.Net.Http/HeaderEncodingSelector`1.xml
index a4747c1dfaa..bde91e27769 100644
--- a/xml/System.Net.Http/HeaderEncodingSelector`1.xml
+++ b/xml/System.Net.Http/HeaderEncodingSelector`1.xml
@@ -24,10 +24,10 @@
   </ReturnValue>
   <Docs>
     <typeparam name="TContext">To be added.</typeparam>
-    <param name="headerName">To be added.</param>
-    <param name="context">To be added.</param>
-    <summary>To be added.</summary>
-    <returns>To be added.</returns>
+    <param name="headerName">The name of the header to specify for the encoding.</param>
+    <param name="context">The type we are encoding/decoding the headers for.</param>
+    <summary>Represents a method that specifies the encoding to use when interpreting header values.</summary>
+    <returns>The encoding to use, or <see langword="null"/> to use the default behavior.</returns>
     <remarks>To be added.</remarks>
   </Docs>
 </Type>
diff --git a/xml/System.Net.Http/HttpKeepAlivePingPolicy.xml b/xml/System.Net.Http/HttpKeepAlivePingPolicy.xml
index bbf4c3c4aa4..756ed2291c7 100644
--- a/xml/System.Net.Http/HttpKeepAlivePingPolicy.xml
+++ b/xml/System.Net.Http/HttpKeepAlivePingPolicy.xml
@@ -13,7 +13,7 @@
     <BaseTypeName>System.Enum</BaseTypeName>
   </Base>
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Specifies when the HTTP/2 ping frame is sent on an idle connection.</summary>
     <remarks>To be added.</remarks>
   </Docs>
   <Members>
@@ -34,7 +34,7 @@
       </ReturnValue>
       <MemberValue>1</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>Sends a keep alive ping for the whole lifetime of the connection.</summary>
       </Docs>
     </Member>
     <Member MemberName="WithActiveRequests">
@@ -54,7 +54,7 @@
       </ReturnValue>
       <MemberValue>0</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>Sends a keep alive ping only when there are active streams on the connection.</summary>
       </Docs>
     </Member>
   </Members>
diff --git a/xml/System.Net.Http/MultipartContent.xml b/xml/System.Net.Http/MultipartContent.xml
index 2b29c753104..3f3c7e6f568 100644
--- a/xml/System.Net.Http/MultipartContent.xml
+++ b/xml/System.Net.Http/MultipartContent.xml
@@ -414,8 +414,8 @@ This operation blocks until all of the content has been written to the memory st
         <ReturnType>System.Net.Http.HeaderEncodingSelector&lt;System.Net.Http.HttpContent&gt;</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets or sets a callback that decode response header values.</summary>
+        <value>The header encoding selector callback to decode the value for the specified response header name, or <see langword="null"/> to indicate the default behavior.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
diff --git a/xml/System.Net.Http/SocketsHttpHandler.xml b/xml/System.Net.Http/SocketsHttpHandler.xml
index d8bdc9c7f23..0b8796ca754 100644
--- a/xml/System.Net.Http/SocketsHttpHandler.xml
+++ b/xml/System.Net.Http/SocketsHttpHandler.xml
@@ -298,8 +298,9 @@ The default proxy is used only when <xref:System.Net.Http.SocketsHttpHandler.Use
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets or sets a value that indicates whether additional HTTP/2 connections can be established to the same server when the maximum number of concurrent streams is reached on all existing connections.</summary>
+        <value>
+          <see langword="true" /> if additional HTTP/2 connections are allowed to be created; otherwise, <see langword="false" />.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -349,8 +350,9 @@ The default proxy is used only when <xref:System.Net.Http.SocketsHttpHandler.Use
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets a value that indicates whether the handler is supported on the current platform.</summary>
+        <value>
+          <see langword="true" /> if the handler is supported; otherwise, <see langword="false" />.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -370,9 +372,18 @@ The default proxy is used only when <xref:System.Net.Http.SocketsHttpHandler.Use
         <ReturnType>System.TimeSpan</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
-        <remarks>To be added.</remarks>
+        <summary>Gets or sets the keep alive ping delay.</summary>
+        <value>The keep alive ping delay. Defaults to <see cref="F:System.Threading.Timeout.InfiniteTimeSpan" />.</value>
+        <remarks>
+          <format type="text/markdown"><![CDATA[
+
+## Remarks
+
+The client will send a keep alive ping to the server if it doesn't receive any frames on a connection for this period of time. This property is used together with <xref:"P:System.Net.Http.SocketsHttpHandler.KeepAlivePingTimeout%2A" /> to check whether the connection is broken.
+
+Delay value must be greater than or equal to 1 second. Set to <xref:System.Threading.Timeout.InfiniteTimeSpan> to disable the keep alive ping.
+
+  ]]></format></remarks>
       </Docs>
     </Member>
     <Member MemberName="KeepAlivePingPolicy">
@@ -391,9 +402,16 @@ The default proxy is used only when <xref:System.Net.Http.SocketsHttpHandler.Use
         <ReturnType>System.Net.Http.HttpKeepAlivePingPolicy</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
-        <remarks>To be added.</remarks>
+        <summary>Gets or sets the keep alive ping behaviour.</summary>
+        <value>The keep alive ping behaviour.</value>
+        <remarks>
+          <format type="text/markdown"><![CDATA[
+
+## Remarks
+Keep alive pings are sent when a period of inactivity exceeds the configured <xref:System.Net.Http.SocketsHttpHandler.KeepAlivePingDelay> value.
+
+  ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="KeepAlivePingTimeout">
@@ -412,9 +430,18 @@ The default proxy is used only when <xref:System.Net.Http.SocketsHttpHandler.Use
         <ReturnType>System.TimeSpan</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
-        <remarks>To be added.</remarks>
+        <summary>Gets or sets the keep alive ping timeout.</summary>
+        <value>The keep alive ping timeout. Defaults to 20 seconds.</value>
+        <remarks>
+          <format type="text/markdown"><![CDATA[
+
+## Remarks
+Keep alive pings are sent when a period of inactivity exceeds the configured <xref:System.Net.Http.SocketsHttpHandler.KeepAlivePingDelay> value. The client will close the connection if it doesn't receive any frames within the timeout.
+
+Timeout must be greater than or equal to 1 second. Set to <xref:System.Threading.Timeout.InfiniteTimeSpan> to disable the keep alive ping timeout.
+
+  ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="MaxAutomaticRedirections">
@@ -665,8 +692,8 @@ For example, if the value is 64, then 65,536 bytes are allowed for the maximum r
         <ReturnType>System.Net.Http.HeaderEncodingSelector&lt;System.Net.Http.HttpRequestMessage&gt;</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets or sets a callback that decodes request headers values.</summary>
+        <value>The header encoding selector callback to decode the value for the specified response header name, or <see langword="null"/> to indicate the default behavior.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -715,8 +742,8 @@ Draining occurs when a request is cancelled or a response is disposed prior to f
         <ReturnType>System.Net.Http.HeaderEncodingSelector&lt;System.Net.Http.HttpRequestMessage&gt;</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets or sets a callback that decodes response headers values.</summary>
+        <value>The header encoding selector callback to decode the value for the specified response header name, or <see langword="null"/> to indicate the default behavior.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
diff --git a/xml/System.Net.Sockets/SocketTaskExtensions.xml b/xml/System.Net.Sockets/SocketTaskExtensions.xml
index b718f3e8bfc..e2d5416be8d 100644
--- a/xml/System.Net.Sockets/SocketTaskExtensions.xml
+++ b/xml/System.Net.Sockets/SocketTaskExtensions.xml
@@ -205,11 +205,11 @@
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="2" FrameworkAlternate="net-5.0" />
       </Parameters>
       <Docs>
-        <param name="socket">To be added.</param>
-        <param name="remoteEP">To be added.</param>
-        <param name="cancellationToken">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="socket">The socket that is used for establishing a connection.</param>
+        <param name="remoteEP">An EndPoint that represents the remote device.</param>
+        <param name="cancellationToken">A cancellation token that can be used to signal the asynchronous operation should be canceled.</param>
+        <summary>Establishes a connection to a remote host.</summary>
+        <returns>A task that represents the asynchronous connection operation.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -258,7 +258,7 @@
         <param name="address">The IP address of the remote host.</param>
         <param name="port">The port number of the remote host.</param>
         <summary>Establishes a connection to a remote host. The host is specified by an IP address and a port number.</summary>
-        <returns>To be added.</returns>
+        <returns>A task that represents an asynchronous connection operation.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -385,12 +385,12 @@
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="3" FrameworkAlternate="net-5.0" />
       </Parameters>
       <Docs>
-        <param name="socket">To be added.</param>
-        <param name="address">To be added.</param>
-        <param name="port">To be added.</param>
-        <param name="cancellationToken">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="socket">The socket to perform the connect operation on.</param>
+        <param name="address">The IP address of the remote host.</param>
+        <param name="port">The port number of the remote host.</param>
+        <param name="cancellationToken">A cancellation token that can be used to signal the asynchronous operation should be canceled.</param>
+        <summary>Establishes a connection to a remote host, which is specified by an IP address and a port number.</summary>
+        <returns>A task that represents the asynchronous connection operation.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -419,12 +419,12 @@
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="3" FrameworkAlternate="net-5.0" />
       </Parameters>
       <Docs>
-        <param name="socket">To be added.</param>
-        <param name="addresses">To be added.</param>
-        <param name="port">To be added.</param>
-        <param name="cancellationToken">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="socket">The socket that the connect operation is performed on.</param>
+        <param name="addresses">The IP addresses of the remote host.</param>
+        <param name="port">The port number of the remote host.</param>
+        <param name="cancellationToken">A cancellation token that can be used to signal the asynchronous operation should be canceled.</param>
+        <summary>Establishes a connection to a remote host, which is specified by an array of IP addresses and a port number.</summary>
+        <returns>A task that represents the asynchronous connection operation.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -453,12 +453,12 @@
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="3" FrameworkAlternate="net-5.0" />
       </Parameters>
       <Docs>
-        <param name="socket">To be added.</param>
-        <param name="host">To be added.</param>
-        <param name="port">To be added.</param>
-        <param name="cancellationToken">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="socket">The socket to perform the connect operation on.</param>
+        <param name="host">The name of the remote host.</param>
+        <param name="port">The port number of the remote host.</param>
+        <param name="cancellationToken">A cancellation token that can be used to signal the asynchronous operation should be canceled.</param>
+        <summary>Establishes a connection to a remote host, which is specified by a host name and a port number.</summary>
+        <returns>A task that represents an asynchronous connection operation.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
diff --git a/xml/System.Net.Sockets/TcpClient.xml b/xml/System.Net.Sockets/TcpClient.xml
index 8ea3b6af2f5..913e51e7030 100644
--- a/xml/System.Net.Sockets/TcpClient.xml
+++ b/xml/System.Net.Sockets/TcpClient.xml
@@ -1296,12 +1296,33 @@ The `Available` property is a way to determine whether data is queued for readin
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="2" FrameworkAlternate="net-5.0" />
       </Parameters>
       <Docs>
-        <param name="address">To be added.</param>
-        <param name="port">To be added.</param>
-        <param name="cancellationToken">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="address">The IP address of the remote host.</param>
+        <param name="port">The port number of the remote host.</param>
+        <param name="cancellationToken">A cancellation token that can be used to signal the asynchronous operation should be canceled.</param>
+        <summary>Connects the client to a remote TCP host using the specified IP address and port number as an asynchronous operation.</summary>
+        <returns>A task that represents the asynchronous connection operation.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+ This operation will not block. The returned task will complete after the TCP connection has been established. This method does not block the calling thread while the connection request is underway.  
+  
+ Call this method to establish a synchronous remote host connection to the specified IP address and port number as an asynchronous operation. After connecting with the remote host, use the <xref:System.Net.Sockets.TcpClient.GetStream%2A> method to obtain the underlying <xref:System.Net.Sockets.NetworkStream>. Use this `NetworkStream` to send and receive data.  
+  
+> [!NOTE]
+>  If you receive a <xref:System.Net.Sockets.SocketException>, use <xref:System.Net.Sockets.SocketException.ErrorCode%2A?displayProperty=nameWithType> to obtain the specific error code. After you have obtained this code, you can refer to the [Windows Sockets version 2 API error code](/windows/desktop/winsock/windows-sockets-error-codes-2) documentation for a detailed description of the error.  
+  
+> [!NOTE]
+>  This member outputs trace information when you enable network tracing in your application. For more information, see [Network Tracing in the .NET Framework](/dotnet/framework/network-programming/network-tracing).  
+  
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.ArgumentNullException">The <paramref name="address" /> parameter is <see langword="null" />.</exception>
+        <exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="port" /> is not between <see cref="F:System.Net.IPEndPoint.MinPort" /> and <see cref="F:System.Net.IPEndPoint.MaxPort" />.</exception>
+        <exception cref="T:System.Net.Sockets.SocketException">An error occurred when accessing the socket.</exception>
+        <exception cref="T:System.ObjectDisposedException">
+          <see cref="T:System.Net.Sockets.TcpClient" /> is closed.</exception>
+        <altmember cref="M:System.Net.Sockets.TcpClient.GetStream" />
       </Docs>
     </Member>
     <Member MemberName="ConnectAsync">
@@ -1328,12 +1349,34 @@ The `Available` property is a way to determine whether data is queued for readin
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="2" FrameworkAlternate="net-5.0" />
       </Parameters>
       <Docs>
-        <param name="addresses">To be added.</param>
-        <param name="port">To be added.</param>
-        <param name="cancellationToken">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="addresses">The array of IP address of the remote host.</param>
+        <param name="port">The port number of the remote host.</param>
+        <param name="cancellationToken">A cancellation token that can be used to signal the asynchronous operation should be canceled.</param>
+        <summary>Connects the client to a remote TCP host using the specified IP addresses and port number as an asynchronous operation.</summary>
+        <returns>A task that represents the asynchronous connection operation.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+ This operation will not block. The returned task will complete after the TCP connection has been established. This method does not block the calling thread while the connection request is underway.  
+  
+ This method is typically used immediately after a call to the <xref:System.Net.Dns.BeginGetHostAddresses%2A> method, which can return multiple IP addresses for a single host. Call this method to establish a synchronous remote host connection to the host specified by the array of IP addresses and the port number as an asynchronous operation. After connecting with the remote host, use the <xref:System.Net.Sockets.TcpClient.GetStream%2A> method to obtain the underlying <xref:System.Net.Sockets.NetworkStream>. Use this `NetworkStream` to send and receive data.  
+  
+> [!NOTE]
+>  If you receive a <xref:System.Net.Sockets.SocketException>, use <xref:System.Net.Sockets.SocketException.ErrorCode%2A?displayProperty=nameWithType> to obtain the specific error code. After you have obtained this code, you can refer to the [Windows Sockets version 2 API error code](/windows/desktop/winsock/windows-sockets-error-codes-2) documentation for a detailed description of the error.  
+  
+> [!NOTE]
+>  This member outputs trace information when you enable network tracing in your application. For more information, see [Network Tracing in the .NET Framework](/dotnet/framework/network-programming/network-tracing).  
+  
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.ArgumentNullException">The <paramref name="ipAddresses" /> parameter is <see langword="null" />.</exception>
+        <exception cref="T:System.ArgumentOutOfRangeException">The port number is not valid.</exception>
+        <exception cref="T:System.Net.Sockets.SocketException">An error occurred when attempting to access the socket.</exception>
+        <exception cref="T:System.ObjectDisposedException">The <see cref="T:System.Net.Sockets.Socket" /> has been closed.</exception>
+        <exception cref="T:System.Security.SecurityException">A caller higher in the call stack does not have permission for the requested operation.</exception>
+        <exception cref="T:System.NotSupportedException">This method is valid for sockets that use the <see cref="F:System.Net.Sockets.AddressFamily.InterNetwork" /> flag or the <see cref="F:System.Net.Sockets.AddressFamily.InterNetworkV6" /> flag.</exception>
+        <altmember cref="T:System.Net.Sockets.TcpListener" />
       </Docs>
     </Member>
     <Member MemberName="ConnectAsync">
@@ -1360,12 +1403,36 @@ The `Available` property is a way to determine whether data is queued for readin
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="2" FrameworkAlternate="net-5.0" />
       </Parameters>
       <Docs>
-        <param name="host">To be added.</param>
-        <param name="port">To be added.</param>
-        <param name="cancellationToken">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="host">The DNS name of the remote host.</param>
+        <param name="port">The port number of the remote host.</param>
+        <param name="cancellationToken">A cancellation token that can be used to signal the asynchronous operation should be canceled.</param>
+        <summary>Connects the client to the specified TCP port on the specified host as an asynchronous operation.</summary>
+        <returns>A task that represents the asynchronous connection operation.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+ This operation will not block. The returned task will complete after the TCP connection has been established. This method does not block the calling thread while the connection request is underway.  
+  
+ Call this method to establish a synchronous remote host connection to the specified host name and port number as an asynchronous operation. After connecting with the remote host, use the <xref:System.Net.Sockets.TcpClient.GetStream%2A> method to obtain the underlying <xref:System.Net.Sockets.NetworkStream>. Use this `NetworkStream` to send and receive data.  
+  
+ If IPv6 is enabled and the <xref:System.Net.Sockets.TcpClient.ConnectAsync%28System.String%2CSystem.Int32%29> method is called to connect to a host that resolves to both IPv6 and IPv4 addresses, the connection to the IPv6 address will be attempted first before the IPv4 address. This may have the effect of delaying the time to establish the connection if the host is not listening on the IPv6 address.  
+  
+> [!NOTE]
+>  If you receive a <xref:System.Net.Sockets.SocketException>, use <xref:System.Net.Sockets.SocketException.ErrorCode%2A?displayProperty=nameWithType> to obtain the specific error code. After you have obtained this code, you can refer to the [Windows Sockets version 2 API error code](/windows/desktop/winsock/windows-sockets-error-codes-2) documentation for a detailed description of the error.  
+  
+> [!NOTE]
+>  This member outputs trace information when you enable network tracing in your application. For more information, see [Network Tracing in the .NET Framework](/dotnet/framework/network-programming/network-tracing).  
+  
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.ArgumentNullException">The <paramref name="hostname" /> parameter is <see langword="null" />.</exception>
+        <exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="port" /> parameter is not between <see cref="F:System.Net.IPEndPoint.MinPort" /> and <see cref="F:System.Net.IPEndPoint.MaxPort" />.</exception>
+        <exception cref="T:System.Net.Sockets.SocketException">An error occurred when accessing the socket.</exception>
+        <exception cref="T:System.ObjectDisposedException">
+          <see cref="T:System.Net.Sockets.TcpClient" /> is closed.</exception>
+        <altmember cref="M:System.Net.Sockets.Socket.Connect(System.Net.EndPoint)" />
+        <altmember cref="M:System.Net.Sockets.TcpClient.GetStream" />
       </Docs>
     </Member>
     <Member MemberName="Connected">