The first category is on-page factors, which include all the elements of a web page. The second category is off-page factors, which include inbound links, social media, authority, etc. However, are you aware of all the factors that make up these two categories?
Our friends over at Search Engine Land released an awesome new infographic that uses the periodic table format to explain all of the SEO ranking factors. Two versions of the infographic are below, but you can download the full-sized version from Search Engine Land.