Just built my first gaming pc, what should i play?

check your monitor's refresh rate is set properly first. a lot of new builds run at 60hz for weeks because nobody changed it in windows display settings, and it's free fps feel. plug the display cable into the graphics card, not the motherboard.

what were you playing before? changes the answer a lot. coming from console, Cyberpunk 2077 and Red Dead 2 are the usual 'look what my pc can do' games, and Elden Ring if you like getting punished. for something to sink months into, Baldur's Gate 3 or Factorio. and try a genre that's just better with a mouse, like a proper strategy game.