As one poster before me said, I also am not an expert, so this is just an advice. Try to get hardware wallets, because right now, they are simply the best (TREZOR, Ledger). They are not free however. If you want better security for free, try using paper wallets, but keep in mind that those can get stolen and easily used or damaged/lost. If you lose a hardware wallet, you can restore your assets on new one using passphrase.