If you do like most people on DP, you just have to start a thread saying you are an expert and poof, you are! Something like, "SEO Expert Offering Bill and Teds Excellent Link Building Program - $5 for 1 Million Backlinks - Guaranteed Results" Really there is no legitimate way of becoming an expert fast, you need to study and run your own test sites to learn advanced SEO.
To become a SEO expert, you need to read a lot about how to improve a website, so you need to know all the requirements needed. But read, it's the most important for making SEO and understand what you should do.