How do I create a multiplayer game?

i want to create a multiplayer game like counter strike with ue4 but i am noob in multiplayer game . i want to learn Theory of multiplayer game and i want a tutorial series for make full multiplayer game

Please view our Video Tutorial Series:

Blueprint Networking Tutorials - Unreal Engine

And our Documentation:

Cheers and happy developing!

I am also a noob and came searching for answers