I am completely new to this business, but have already used some exchanges. Many of them turned out to be dishonest. Where do you store your bitcoins?
Centralized exchanges are used only trading and exchanging coins/fiat and not for storing and holding any coins.
You are not holding keys for coins you have on your account, exchange is the real owner and history showed that almost all exchanges got hacked at some point of time (Binance, MtGox, etc).
If you want to hold your coins withdraw them from exchange to some open source wallets like Electrum or safer option is to use open source hardware wallets like Trezor, Coldcard or Bitbox.
Most important thing is to keep your seed words or private key offline secure and never share them with anyone or enter on some websites.