About cold wallets and hot wallets:
Assets are actually recorded on the blockchain at all times; what a wallet stores is the private key that controls those assets.
The difference between “cold” and “hot” isn’t the form the wallet takes, but whether the private key has ever been exposed to an internet-connected environment.
$BTC 78254.01(+0.71%)

There are significant fluctuations, so size your position according to your risk tolerance.