Binance, Bitfinex, Bittrex... are all fine. Poloniex used to be really popular, Kucoin is now, IDEX is decentralized and probably not what you're after but is actually a quite decent exchange. If you have any specific demands, like, you have a specific card you'd like to purchase with, that would be the direction you'd be looking at. So "exchanges that accept X card". And that would narrow your search a lot. Or if you have specific country demands, search by looking at that. All exchanges actually work and are not much risky if you withdraw money after your trades. Even the largest exchanges used to get hacked/collapse, and it will happen again. Just avoid that risk and you should be good.