from what i know \ hear, relevant backlinks are key. but what is this a reference to? is it a reference to the domain? or the individual page itself? like would a backlink be equally strong on a URL like, blahblah.com/fitness-tips/ (if i'm promoting a fitness website)? or would it be best just to focus on sites that are purely based on fitness (like fitnessworld.com)? thanks in advanced!