This is just a guess.. but it seems as if the site has some kind of scale which is used to judge the required skill level. For instance, on a 1-5 scale the value 1 might mean "low skill level" and 5 "high skill level".
Does that makes sence?
The scales are often subjective which means you have to judge yourself.
I've read about this kind of thing at the checkout counter. That's where I met this tiny ad:
Sauce Labs - World's Largest Continuous Testing Cloud for Websites and Mobile Apps