How rep works

I should own a fidget spinner (Autism intensified), been on this site for like 5 years and still doesn't how rep works. I've hear people with rep 10 when they rep you it doesn't count but how does it work? From a staff perspective or a higher up with rep person?

Basically the only people who can give you rep are people who have more than 10 rep. They don't have to be people with premium, staff etc. Just have more than 10 rep. Then the amount they can give you is calculated through their join date, post amount and how much rep they have themselves.