I am just starting out and slowly learning SEO. I want to create a test site to see if I can experiment and learn as I go. From what I can tell, first place to look at is on site SEO. Titles, h1's etc - are meta tags still important these days? After this is where I get a little lost. Backlinks are important, do I focus on social (web 2.0?) links, youtube or building up a PBN with some authority domains?