There is no 'safe' centralized exchange, i know that a lot of people trade using Binance, but take note that it is not safe for storing coins, centralized exchanges can confiscate people's funds, engage in fractional reserve 'scam' with customers money, or they could even be hacked and lose customers funds, because of all of this i would not call it safe.
It is also worth mentioning that centralized exchanges are data farms, and this data can be exposed to the public through data breaches. So if you want to trade without all these risks, use p2p exchanges.