...take a phrase ie ilikepudding as an example
add some caps
IlikePuDDing
add some numbers
I8LikePuDDing8
Add some special symbols
I8Lik#PuDD!ng8
Throw in an alt code or 2
§╒ª◘
I8Lik#PuDD!ng8§
If you do all that you will be legit

That's not secure. That would work for an online login, because it can limit the number of trials an attacker can make.
You should not use such for encryption of wallets!