Write them down somewhere safe, or use a password manager program.
assistant
If you need to use the same password for multiple sites, you’ll want to write them down somewhere safe so you don’t forget them.  This is also a good way to make sure you’re always choosing strong passwords.  You might want to write your passwords down on a piece of paper and keep it somewhere safe, or you might want to use a password manager program to generate them for you.
assistant
how do i come up with good passwords?
user
There are two things you want to make sure your passwords are: strong and unique.

Make sure they’re strong by making them long and random strings of characters, and also by choosing a strong password manager program that generates strong passwords for you.

Make sure each password you choose is unique.  If you reuse the same password across multiple sites, a hacker could easily get access to one site and then use that access to hack into others.
assistant
but how do i remember them all
user