Thank you for correcting my mistake, so that the information regarding Electrum is clear. And make newbies understand more about Electrum.
Because I never used Electrum,
Just to add, you can even encrypt your bitcoin wallet using a hardware device by connecting it to
verified Electrum Bitcoin Wallet. Most people often uses Electrum as their wallet interface by integrating it to hardware devices in order to increase the privacy rather than using the Leger Live (if ever you are using Ledger Products). This means that you need to have your hardware wallet ready when you open the electrum application.
In case OP still has any doubts why holding bitcoin to an exchanges is risky, then it would be better to take a look at this massive list of exchanges going
AWOL. Regardless of how reputable and distinguished these exchanges are, it is still a matter of time before these incidents might happen.
[1]
Exchange Graveyard