Ok….getting ready to build my first niche blog…have some qs

Ok, I have spent this entrire week reading many articles on this site and watching as many youtube vids as i can to try and learn quick about how to build blog & do good seo on the blog and then do backlinks, set up social media accts for each blog, etc etc

I have come across some things in the various posts that i do not understand – i was hoping to get some answers here.

1) what specifically is a web 2.0 site? the articles mention building these and setting up links to an 'authority…

Ok….getting ready to build my first niche blog…have some qs ^(http://techmantraservices.com/goto/https://www.blackhatworld.com/seo/ok-getting-ready-to-build-my-first-niche-blog-have-some-qs.1012028/)