First of all few things to clear up here!

There is nothing like exchanger for beginners or experts! All of them have variances in terms of volumes, market cap, slight price variation etc. They all are can be used by anyone at any level of trading. You can make same profits in the X exchanger and same profits in another Y exchanger because that all depends upon your strategies, techniques and methodology of trading.

So binance, Huobi, Gate etc are the most famous now and then.