SEO training with Yoast
I found a great course on https://yoast.com/free-seo-for-beginners-course-now-available/.
The first lesson taught me about google and how google has become the largest search engine. Google also uses special filters to prevent people from cheating when it comes to search engines. They use filters like Panda and Penguin to prevent things like keyword stuffing. Google uses crawlers or robots to search the site for links and to index the site in googles database. It keeps track of keywords, site content, links, speed and other subjects contained in googles algorithm. Yoast also offers a free plugin to help with optimization for wordpress.