No one has mentioned it yet, so here it is. If you don't control your private keys, you don't control your bitcoin (or other cryptocurrency). Hardware wallets a

No one has mentioned it yet, so here it is. If you don't control your private keys, you don't control your bitcoin (or other cryptocurrency). Hardware wallets are easy to use. Of course you still have to physically secure hardware wallets, but at least you're in complete control of screwing that up.