[LamaOfRuin]

I would classify all of those as "non-traditional" learning techniques, unless you actually mean using a textbook while taking a class with a human teacher.

Well written textbooks are consumable on their own for some people, but most are not written for that.

[djmips]

That's a good observation about textbooks and helps explain why I had difficulties trying to teach myself topics from a textbook alone!

[ghaff]

A lot just aren't very good but they also tend to make assumptions about prior knowledge in line with what would be typical prerequisites for a class and some degree of guidance.