I consider some steps the best way to define your passwords:

1. Try not to reuse the same password for different services;
2. Use more than 8 characters;
3. Use special characters like "@#$%^[ ] ( )";
4. Use numbers;
5. Use UPPER case and lower case;
6. Use a security app to save your passwords;
7. Change your passwords at least once a year;
8. Don't share your passwords;
9. Don't send passwords via message to anybody;
10. Don't use birthdays;
11. Don't use easy words like "password123", "loveme", "love123" and more;
12. Use a second-factor authentication;
13. Use an app as a second-factor authentication; don't use SMS if it's possible.

Security apps:

1. iSenha segura: https://apps.apple.com/br/app/isenha-segura/id1555516679
2. Passwords from Apple;

Second-factor authentication:

1. Microsoft Authenticator
2. Google Authenticator