Current UK Government advice is to use three random words to create your password. Add more words, numbers and symbols if you need to.
Avoid using personal details in your password and never use the default password for any device or account you setup.
I recommend using a password manager to help create and remember separate passwords for each of your accounts. But at the very least, you should use a strong and separate password for your email account. If someone can get access to your email, they’ll be able to reset your passwords elsewhere and it’ll be game over.
Advice around creating and using passwords
Check the strength of a password
Regardless of the strength of your passwords, use two-factor authentication (2FA) wherever it is available. This will help protect an account if the password is revealed by a keylogger, phishing or other form of attack.