In the last couple of weeks XRB coin was stolen from Bitgrail exchange and Binance locked customers out of their exchange. Both things happened suddenly and without warning. Take your own security seriously.
Use 2 factor authentication, strong passwords, and enable any security feature that exchanges offer.
The best thing you can do….
Invest in a hardware wallet. Just get one. Buy a Trezor or a Ledger Nano S.
I do not want anyone to lose their investments. Hardware wallets are one of the best ways to keep them safe. Even if you are investing small amounts get a hardware wallet. You most likely keep your cash in a bank, do the same with your crypto.
This will be your best investment.