Like Dutch_Master suggested, you might look to start with a “live USB” my main advise would be “google is your friend” (or ddg.gg /startpage etc)
A Live USB is literally a thumb stick, with the whole operating system on it, like a grown-up chromecast, but for a desktop.
You can run the computer from the stick, and do a bunch of stuff; web browsing, office work and stuff.
But, it would be a temporary setup, and you can install some games, but the graphics might not be great.
But, good enough to play around with, poke at menu’s, browse websites and stuff.
I would recommend making a coffee and checking this thread:
then this:
but really, start out and give it a go.
If you can get a spare SSD, and put your windows one away safely, then you can always come back to it, easy peasy, no muss, no fuss.
Or you can dual boot, but be careful not to get one system messing with another too much.
Welcome though, and be ready to search stuff.