how you guys keep your crypto when do trading?
leave it in exchange wallet? Isn't it too risky?
Store in a hot or cold personal wallet? isn't it too annoying to transmit every time?
Just divide your coins between actively traded and holdings. For storing your altcoins look for hardware wallets like trezor, nano ledger. If you are trader who trades daily on exchanges you can spread your balances between big exchanges and lock them with additional passwords. It is not rocket science

But the big question here must be, how often you will be withdrawing from your exchange ?
Because exchange hacking are happening most commonly these days and I am also curious about how traders are managing with their funds in exchanges.
It is always suggested not to keep big funds in the exchanges but practically we are unable to move funds back and forth on daily basis. I'm seeing this is also another kind of risk we must need to undergo for the reason of having quick trading. But, maintaining minimum funds as much is possible is one simple way to secure ourselves.