In parallell, or instead of, following the suggested path, you may use the material and learn about this subject entirely in your own way.
Each section (WHY, WHAT and HOW) starts with a short summary with hyper-text links. From these summary documents you may get on the course path, or you may use the hyper-text links to learn about a subject of your choice.
Some subjects have links to documents with additional information, which you may follow if you are interested.
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