When you say all exchanges, is that the two you mentioned or more? (Binance, Kucoin )
Yeah both of them are exchange sites.binance and kucoin also are currently the 2 biggest exchange site. You don't need to do KYC on binance if you want to try that exchange
I'm sorry, what is a CEX vs. a DEX?
CEX = centralized exchange
DEX = Decentralized exchange