What is quality and relevant content?
The most important determinant of the quality of your content is its uniqueness. Like people, search engines want to see unique information. Imagine if the opposite was true, the internet would be full of irrelevant information that can be found in multiple locations. What a terrible place this would be! Since search engines strive to deliver value to their users, they penalize the use of duplicate content. In order to rank high on SERPs, you need to have original content that adds value to your users. Furthermore, you must base your content on solid keyword research: you must know how your users communicate their intent and what information they are looking for. You must build your content around the keywords and language they use. When you think of your site content, think of value. How does your content add value to your users and your community? People and search engines alike will reward you based on how much you contribute.