What is your purpose of using exchanges? If it's just for buying Bitcoin and then send it immediately to your wallet, then any "trusted" and top exchanges in coinmarketcap is fine to use, they have pros and cons such as Binance, Kraken etc just make sure to know what to do there. But if it's to store your cryptocurrency assets then you should not put it there, go find some hardware or software wallet out there then you're good to go for early.