You're confusing "minimum" with "minimal".

Minimal length would be something short or small.  A password that is 7 characters long or shorter is of "minimal" length; it is below the recommended minimum of 8 characters.  Passwords should never be of minimal length, because that would be too easy for a password-cracking program to discover.

Minimum length would be the lowest length or size of something, that is, the bottom limit or the lowest acceptable amount.  A password should be, at a minimum, 8 characters long.  It should be at least 8 characters long, however a longer password is better.

You're welcome.

I don't really know anything about you.  I just made the assumption that English was not your native language, and this was a natural mistake.

I have a lot of admiration for anyone who has the initiative to earn a certification like this, in a non-native language.  I couldn't imagine trying to get an advanced degree and professional certification in a different language.