At its heart, SEO (search engine optimisation) is simple. The basics of SEO haven’t really changed since Google first started dominating the way people search the internet: make each page relevant to the topic it’s about; keep to just one topic per page; get some proof that it’s a worthy page by getting links pointing back to it.
Of course, like everything that’s outwardly simple, there are a lot of small details that need to be right.
Which is where SEO training comes in.