Tell me how these multiplayers work?
- gta network
- five mp
- rage mp

Help me understand how they work.
I want to understand deeper in order to write scripts for multiplayer correctly.

I guess you have to specify your question a little more. What information exactly are you seeking?

Those games have different architecture and consideration on working in a multiplayer environment which we can't explain in detail because we (the community) don't know how those developers implemented their code. If it is a question about multiplayer games in general, there are plenty of tutorials and articles about that topic you might want to search or look here for example