How to make a multiplayer game like PUBG.What should i learn

Answer 1

PUBG was made using Unreal Engine.
You can develop games using any game engine or framework which depends upon your skill set.

Answer 2

Not wanting to break your dreams, but the thing is, alone, it is practically impossible to make something even close to PUBG.

Answer 3

it'll take time and effort but you can't directly say that it's impossible.
To make games like this you gotta work a lot on game engines , even you can make your own for the starting also remember If you're dedicated than nothing is impossible.