Play in Guest mode @ Beginner level. That way, you won’t worry about losing or hurting your rating.
However please be advised: only 1 in 7 players in “Beginner” are actually beginners; the other 6 are intermediate or advanced. Sometimes it’s as bad as 1 beginner for every 33 intermediate/advanced.
Not sure why it works out that way.
So maybe try a few things and see what you like. I like to test out new things on the Classroom board on this site. Or I practice on bots until I get comfortable. Then I can just play the opening and quit, rather than having to commit to a whole game.