Step 1, Install Netcode for GameObjects

The following is an excerpt from Unity's documentation

Prerequisites

Before you begin, you need the following:

• An active Unity account with a valid license.
• A supported version of Unity. Check Netcode for GameObjects' requirements for the specific version details.
• An existing Unity project. If you're new to Unity, you can refer to the get started section for guidance.

Compatibility

• Unity Editor version 2021.3 or later
• Mono and IL2CPP scripting backends

Supported platforms

• Windows, MacOS, and Linux
• iOS and Android
• XR platforms on Windows, Android, and iOS
• Most closed platforms, such as consoles. Contact the development team for more information about specific closed platforms.
• WebGL (requires Netcode for GameObjects 1.2.0+ and Unity Transport 2.0.0+)

NOTE

When working with closed platforms like consoles (PlayStation, Xbox, Nintendo Switch), there may be specific policies and considerations. Refer to your console's documentation for more information.