Finding a good platform and learn and try out trading of crypto can be confusing and challenging. But as a safe tip to start out, Bybit is a well-known platform with a powerful interface to buy, sell, and do bot trading on crypto and other assets.
They also have a fantastic mobile app (iPhone and Android).
Another service you may want to consider from Bybit is their crypto Visa card. You can use crypto to take out cash and purchase daily life items as a normal Visa/Mastercard.
Using the signup link on this page gives you a $10 bonus when depositing $100 to your account.