What is the safest way to keep bitcoins.
Taken dangers like hacking, losing in to account!
The offline wallet is also known as 'hardware wallet' such as ledger or trezor wallet
The hardware wallet is known as the best and most secure bitcoin and altcoins wallet cause they offline and the private key is saved within the wallet.
Offline wallet is not always known as ledger or trezor wallet because there is a type of offline wallet which doesn't cost too much and you can have that instantly from your home and that is the paper wallet and that is what you need in order keep your coins in a very safest way but also the cheapest way because you just need to print it as a high quality and laminate it and then send your coins there.