Client Sided Dedicated/Lan Multiplayer Help

Hello Can anyone help me I am new in unity multiplayer field. Please answer my question
1. How can we make a multiplayer like CS GO in which play host a game independentely and users join.
2. Will it use up my CCU or not ?
3. What is it called?
P.s any tutorial would be loved thanks for your comments in Advance

 

I don't really understand what you're asking for. But I'm assuming you want to make a dedicated server. If so, yes, it is possible. Yes, of course, it will use your CPU.
If you type "UNET tutorial" on Google I'm pretty sure you'll find something good. As a tip, search for "GTGD UNET". GTGD is the Youtube channel called Gamer To Game Development if I'm not mistaken. UNET is Unity's networking system. I don't want to sound rude but please search on Google for at least 5-10mins before posting on the forum/answer hub.