Although, there are MANY alternatives you could call for Coinbase, but top ones start from Binance and others. There are MANY
Crypto Exchanges out there, so you can pick one that suits you and one that makes you comfortable.
I dont really feel that there is any rocket science to it, but all more to do with common sense only. So, our selection should be made in very careful way, which will also keep us safe and secure with everything.