Let us say you have site url in forum signature and you make 20 posts on 20 different pages. Does Google consider as one backlink or 20 backlinks? I am sure it is 20 backlinks but just want to confirm
Yes, it is the 20 backlinks. But then, not all of them may be useful. If 19 of them are irrelevant to your site, then only relevant one is really useful. This is the one that can give you good traffic and probably money. That is if you're good enough to convert traffic to money.