Some friends are worried about the security of coins stored in exchanges and asked me what to do. I have always used hardware wallets, such as Bitpie Blade, OneKey Classic and Mini. There are also videos or texts on the Internet that introduce how to use old mobile phones to make cold wallets. I think it is also possible, but hardware wallets are not expensive and convenient to use. As long as you have more coins, it is still worth spending money to buy a few hardware wallets.
When buying a hardware wallet, it is recommended to buy 2 or more of the same brand at a time. Generate a mnemonic and address in wallet a, transfer a little bit of coins into it, and then use the mnemonic generated in wallet a to restore the wallet in wallet b to see if the coins are still there, and then transfer the coins out again to see if there are any problems with transfer in, restore, transfer out, and address, then you can use it with confidence. The purpose of buying 2 wallets at the same time is that if the hardware wallet you are using has problems, such as being damaged, you can also import it into another hardware wallet quickly and easily to continue using it. You don't have to have only one, and when you are in a hurry, you can only import the mnemonic into the hot wallet.
At the same time, you can also take a look at some help documents on the official website of OneKey, whether you can use them for the time being or not, understand what they say, and follow them. You will feel much more at ease.
Today, there is an article circulating online about a person who used a cloud server but did not change the password of the cloud server. Hackers took nearly a day to sell all the coins in his wallet. Security issues cannot be taken too seriously.
Hardware wallet + Mac computer + iPhone + 1password + leading exchange + good security usage habits can only make yourself relatively safer.