Hello! I would like to ask some tips on how to rank my site on Google! In particular, I'm wondering, if it can happen through commenting under linked stories from other sites! Do these comments count as site's original content?
Anything that is on a page will be spidered by search engines. So if you have comments on a post, those will be picked up. As to how prevalent words are to ranking, there's a whole industry out there (search engine optimization, or SEO) that is constantly trying to figure that out. (And it doesn't help that search engines often change and tweak how those ranks occur.) I'd suggest doing some searches on SEO and reading up on tips and techniques.
Thank you @valMETNG !! I already know some off page techniques, but I can't use them until I upgrade my account!