Updating intro

Author: suearkinunity

Packages/com.unity.inputsystem/Documentation~/TableOfContents.md

@@ -1,12 +1,12 @@
 * [Introduction](index.md)
   * [Installation](Installation.md)
-  * [Quick start guide](quick-start-guide.md)
-  * [Understanding Input](understanding-input.md)
+  * [Concepts](understanding-input.md)
   * [Workflows](workflows.md)
     * [Using the Actions Workflow](using-actions-workflow.md)
     * [Using the PlayerInput Workflow](using-playerinput-workflow.md)
     * [Using the Direct Workflow](using-direct-workflow.md)
   * [Video resources](videos.md)
+  * [Quick start guide](quick-start-guide.md)
 * [Setting up input](setting-up-input.md)
   * [Actions](actions.md)
   * [Input action assets](action-assets.md)

Packages/com.unity.inputsystem/Documentation~/index.md

@@ -16,9 +16,13 @@ This **Input System package** is a newer, more flexible system, which allows you
 > [!TIP]
 > During the installation process for the **Input System** package, the installer offers to automatically deactivate the older built-in system. 
 
-To get started, refer to the [Installation](Installation.md) and [Workflows](workflows.md) sections. 
+To get started, refer to the [Workflows](workflows.md) section to decide how to use Input:
 
-For a demo project, refer tp the [Warriors demo](https://github.com/UnityTechnologies/InputSystem_Warriors) on GitHub.
+* Using actions, which is the recommended workflow.
+* Using both actions and the PlayerInput component, which provides features for callbacks and multiplayer.
+* Directly read device states with a script for fast prototyping or single-platform applications.
+
+For a demo project, refer to the [Warriors demo](https://github.com/UnityTechnologies/InputSystem_Warriors) on GitHub.
 
 ![Screenshot of the Input Actions Editor window displaying the default action map, Actions, and Action Properties. They are displayed in 3 columns side-by-side in that order.](Images/ActionsEditor.png)<br/>
 *The Input Actions Editor, displaying some of the default actions that come pre-configured with the Input System package.*

Packages/com.unity.inputsystem/Documentation~/understanding-input.md

@@ -1,7 +1,7 @@
 ---
-uid: understanding-input
+uid: concepts-input
 ---
-# Understanding input
+# Concepts
 
 Input refers to signals sent by users of your game or app from an input device, such as a keyboard, mouse, touchscreen, gamepad, or joystick. Almost all Unity projects require input of some form, and the Input system package provides a flexible set of features which allow you to configure and respond to input in a way that suits your project.