The best trading platform is Binance, and you can trade a lot of altcoins out there. If you are a beginner you can stay on spot trading. Then if you gain more experience you can switch to futures trading which is more profitable I think.
I agree if you think Binance is the best exchange. I also think so, until now nothing can match Binance, especially now that there are so many members, they are all comfortable with the trading features available in Binance.