During writing this course our team focused on a few aspects but the most important was that the course consisted of only such information, that are actually useful for the process of positioning your website. As far as my experience tells me, courses and books available on the market contain a lot of unnecessary information, often not up to date. The authors boast of the fact that their courses contain 30 hours of materials. But think about the fact, how much of these information will not be useful for you. Usually it is 70-80%.