Start with whatever sport you already watch regularly. That's what I did and it helped a lot. I use https://1xbet.com/en/ and there's tons of sports to pick from but don't just jump around randomly. If you know football then start there because you already understand team form and how matches flow. Put small amounts on simple bets like match winner until you get comfortable. Once you feel confident with one sport then try adding another. I started with football, then added basketball after a few months. Learning too many sports at once just confused me early on. Take it slow and build up your understanding gradually