Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Networking and Serialization Tools (TNet 3) for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Networking and Serialization Tools (TNet 3) v3.3.2
“If possible, please buy the package to support the developer”
TNet 3 is an extension for the Unity Editor that adds easy-to-use networking, powerful serialization tools as well as various useful coding extensions for developers. You can use TNet 3 to add such features as:
* Multiplayer (no user limits)
* Server content delivery
* Save/Load functionality
* Modding support
TNet 3 comes in full C# source code form and has been battle-tested in Starlink and Windward — games released on Android, iOS and Steam.
Detailed tutorials can be found here or in video format here.