I'll second the other posters here suggesting that binance as a good start. At the beginning, it is better to stick with only one (binance) until you have learned the mechanics of trading. In terms of liquidity, it is also one of the best, so you as a beginner won't have any problem with smooth trading.

That's anybody's guess. I try never to listen to other people when it comes to buying tokens. Learn how to conduct your own research before buying a token and in time, you will perfect your skills.