You don't. Hacks target the exchanges wallet by finding exploits and not the user accounts separately. If you want your funds to be safe, use exchanges for trading only and withdraw to your personal wallet.
I love it when people say this. How the heck do you 'trade' if you keep your coins in the wallets... You don't.
IF you're holding, then yes, keep it in your wallet. If you trade it makes no sense.
Yes it is basic knowledge. We must keep the amount we have on the exchange to be able to trade. sometimes some exchange does not offer good security features and even the exchange can make an action that is not commendable by taking over the account we have. every time we entrust the amount we have on the exchange then we must be prepared to face the bad risks occur. Security is only guaranteed when we can save the amount we have on personal wallet, especially is an offline wallet that has a private key security feature. Each coin must have a wallett official and it is the safest option to date.