Creating Strong Passwords

Why a strong password is needed?

Simple answer: to prevent being hack (easy password can be hack using bruteforce method). For example https://blurt.world/pentest/@fajar.purnama/simple-password-bruteforce-demonstration-using-hydra?r=fajar.purnama.

(Unsupported https://www.youtube.com/embed/rZA2juIk0eo)

Elaborated answer: to prevent unintended access to your accounts because:

The can lock you out from your own account.
Impersonate you like in social media to destroy your reputation.
Steal confidential information or at least your privacy.
Steal your funds if you have some sort of electronic money.
In summary, lose everything electronically and maybe even worse as time passes.

Check your email whether it has been pawned or not: https://haveibeenpwned.com

In my opinion a strong password:

Contains small letters (a,b,c,d...).
Contains capital letters (A,B,C,D...).
Contains numbers (1,2,3,4...).
Contains symbol ($,<,>,?,+,+...).

For additional super strong password:

More than 6 characters.
Symbols not on keyboard (ALT+1265=±).
Words not in dictionary.
Starts with symbols.
End with symbols.

Password Example

Example of strong password: My8.oP.

Example of super strong password: ╥F0r.m3-w4T1ng|f0R|YoU╝

If you doubt your previous password, check them whether they have been pawned or not: https://haveibeenpwned.com/Passwords. If you are sure, then don't bother because by putting it will add your password to the website's database or cache.

Disclaimer

Although you have a strong password, it does not protect you from social engineering. For example, clicking on a suspicious link, opening a suspicious attachment, running a suspicious programming, entering your password on a fake login page because you didn't double check the link, etc. This is because you are giving your password to them, in other words, they don't need to guess.