Explain meaning of "compared to normal or power users"

[DinisCruz]

from https://github.com/DinisCruz/Book_Generation_Z_Developer/pull/60

"Being able to write these customizations and understanding at a much deeper level what is possible with these tools is a massive competitive advantage, when compared to 'normal' or 'power' users." -- what do you mean by "compared to normal or power users? it isn't clear, or at least I didn't understand.