In terms of SEO audit, Keyword Density is the percentage of times a keyword is used in the copy. And as such, it equates the number of words in a web copy — then divided by the number of times the keyword appears in a web copy.
Link building is a key part of any successful SEO strategy that involves getting other websites to link to yours — a simple hyperlink from one site to another. It is also agreed by many that it is one of the hardest parts of ranking a website. Whilst, it's also one of the most rewarding when you get it right.
Backlink Management is a method or a way that helps you track and organize your site backlinks with tools like Monitor Backlinks. Given how critical links are to your site’s SEO, it’s wise to have an approach to managing your link profile. And just as authoritative content helps you to rank for relevant keywords, backlinks also reassure the search engine of page authority.
Google Keyword Planner helps you research keywords for your search campaigns. You can also use this free keywords tool to discover new keywords related to your business. And even see estimates of the searches they receive and the cost to target them.