PUBG is the main game.
CSGO would be the second game, but I dont have anyone to play with anymore after being kicked from a group of lads I have played with since I was about 17, all because one is still a child in a mans body.
Same goes for Ready Or Not, bought it for those guys and never played it now as a result.
Other games I play on the side or when I have time/bored/lonely - Rocket League, Trackmania, World War Z, Prison Architect.
Really want to play - A Way Out, It Takes Two, Diablo 4 when its out.