Hello in my Project if i host a session everything is fine but if someone joins this session he can’t do everything but he spawns. Can somebody help me?
Hiya @Issei_Hyakuya! Welcome to the forums!
I would suggest taking a look at the official documentation for Replication.
This is going to help you understand the principles necessary for an online game ( there’s a lot more to it than a single-player game).
Your problem is going to lie either in replication OR that you need to assign a player controller to the spawned character and have the server “give control” to the client for that pawn 
I hope that helps. Get through that stuff and let us know!