Reflection on the book D web development.

[Alaindevos via Digitalmars-d-learn]

I bought the book "D Web Development".
I understand only 20% of the book,the other 80% is way above my 
head.
Compare, I own a book on flask development, and I understand 100% 
of it.
Which means I can use dlang for anything except QT and serious 
web development ...