Yes. Steam is available on Linux, pretty easy to install and it comes with a compatibility layer (Proton) which works quite well.

Linux is a bit different than Windows. But I’d say just using it is about as complicated as using Windows. You’ll just have to try and see whether you like it. And if it’s hard or easy for you to relearn a few things. I mean if you’re in the Browser and Steam all day, those will be the same applications and also look and work the same way. Other than that you could face some issues with gaming hardware and you have to fiddle with things, or everything works out of the box. You can’t tell beforehand.