If you’re just starting out and feeling unsure, I’d suggest avoiding complex strategies or high-stakes games at first. Try something simple and low-risk — crash games like Jet-X are a good intro, since you can play short rounds without much pressure. I found a site that lists where the game is available through apps:
https://jet-x-game.com/apps/. You might also want to read through lowstakesbets.com — they focus on casual play and have some decent beginner-friendly tips.