We always here that we need to have a secure password. But how secure is your password?
Go to this website and test your password(s) out.
https://howsecureismypassword.net/
Want to create a secure password? You can create really secure and impossible to remember passwords at:
https://www.grc.com/passwords.htm
or can go for a password that's more easy to remember, but slightly less secure at:
https://xkpasswd.net/s/
Choose XKCD from the Presets, at least 5 words in the Settings. Choose one of the passwords, run it through the aforementioned test and if it looks good enough, then use it.
Of course instead of memorizing passwords, you're best using a good password vault and I recommend LastPass (www.lastpass.com). You can also use it to generate and remember passwords for you.