It depends on what kind of game you like. Here are 2 video games I play on Linux:
Minecraft is a sandbox game with a survival aspect, where you can be as creative as you want while still having fun challenges. There are many different playing styles. It costs about $30 and requires a Microsoft account to play legally. Minecraft: Java Edition officially runs on Linux. Minecraft: Bedrock Edition (the one with console cross-play) does not run on Linux by any official methods.
Mindustry is a techy/industrial game, I’ve heard some say it’s like if Factorio was a tower defense. It is free and open-source (under GPLv3), requires no account.
For purchasing or acquiring games, I’d recommend Steam. It has lots of games and many of them work on Linux. There’s also Heroic Games Launcher for Epic and GOG games.