How can i casual gamer enter a game online competition? - Leminal Space

Im curious if its possible to enter a game competition or something as a casual player? I want to someday atleast try one but im not sure what game to get better at or what sites to use to enter some without making myself look like a fool? I also dont want to pay because thats sort of like gambling at the start. I have a pretty big bucket list thats always changing if you coudent tell.