I always read about public keys,private keys and speedphrases that you need to store them in a paper wallet or hardware wallet. The only thing I ever stored are the passphrases (those 12 or 24 words) I get from metamask or other wallet provider in the beginning of creating a wallet. Is this enough when I write them down and secure them?
Seriously, buy a Trezor or Ledger. If you are dealing with any serious sum of money stop right in your tracks and do your research. And yes, keep copies of your seed phrases but don’t do it on paper, get them etched into metal and stored in a SECURE place, can’t emphasize that enough.
I sell stainless steel plates: https://cryptonumeris.com
I always am surprised by why people oppose to HW wallets, they are less than $100 and they’re pretty much impossible to “hack”.
If your investment is +10k and you don’t have a HW wallet you’re walking on thin ice.