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Because there is no summary provided. It is common practice to summarize things, being a book, a presentation or a blog post. Great presenters always make summaries. Summaries are a service for the reader/listener. But up to you, if you think that´s not needed.

There is no way you will find a better and more summarized summary than what I already wrote and drafted in my post. Very few words to read, only a few links to «click» on and everything already extensively summarized and wonderfully well explained in an audiovisual way.

So, to find out, learn and discover what the theory is about. The only thing you have to do is find the time that you don't have now and later you will see that it wasn't that complicated. :)