Get a hardware wallet, reputable one, from the website or reputable dealer. Don't buy 2nd hand shady shit from amazon/ebay, those probably have a back door.
Anyway, get a hardware wallet, lock it away somewhere safe, and send any extra crypto to that wallet
From my research I discovered ledger Nano x,which stores private key offline , protecting you from hackers and phishing attacks.i also discovered the likes of Trezor Model T and cold card mk4. Hardware wallets are best and also the safest way to safe bitcoin for long term investment, the only precautions is never to share your passphrase/ private keys online.