Exchange wallets & online wallets are not safe. There is always a risk when you keep your funds at there.You should use a hardware wallet. It's the best way to keep your funds safe.
indeed, only the money that you use for trading you can keep on the exchange. I have already lost some money on the exchange several times due to hacker attacks and now I do not keep money on the exchange
That is so true but there is a scarcity of a proper wallet where we can store various altcoins and it is not a viable option to download all the wallets for each altcoin separately and this is the reason why so many people keep their altcoins in the exchange. To such people I can recommend exodus actually which is a good wallet and I don't know their team or how trusted they are but they have somewhat combined a good looking wallet with in built exchange and also gives you the private key so in case you lose your coins you can enter the word phrase and recover your wallet anywhere.
Keeping your money in exchanges is a dangerous option unless they give you the private key or control over your coins. I would appreciate if someone can recommend a wallet where we can store most of the altcoins and yet is safe. Exodus is good like I said but still feels like an exchange just little safer.