To keep your BTC's safe, you either use a hardware wallet or an airgapped wallet.
A hardware wallet would cost you some money and it is easier to use, especially for newbies, you can set up an airgapped wallet using one of your old devices, but you need to know what you are doing if you must use an airgapped wallet, so it is difficult for newbies to set it up in a safe enviroment. But above all, your funds is only as safe as the device you store it in and your opsec, I.E. if you use a hardware wallet and expose your seed phrase, you'll lose your funds.