This book is hopelessly misleading. It gives an idea about how to draw mind maps, but also gives a horrendous idea of where they are appropriate within learning to learn.
The book more or less junks other forms of note taking in order to market other Buzan products. Nonsense about left and right brain (which has been debunked since the 1970s) is constantly presented as an argument for using your whole range of cortical skills (which cannot even be measurably seperated).
It leaves the reader thinking that just drawing one of these things is good enough. Whereas you really need to be internally active in order to learn.
There is also a crackpot scheme for helping the world to mindmap. If this isn't a cult manual, I don't know what is.
Pseudoscience, quackery, mind myths, and lots of stuff to get you to buy more of the same, without seeing to the needs of learners.
I once heard that management consultants like mind maps, because they are simple. Sounds about right!
Motivational speakers use their whole brain, but the left side has nothing right, and the right side has nothing left!
Learn to use a variety of graphic organisers, and learn to apply them to specific situations, and please don't tell people that you are doing it because otherwise you would not be using both the left and right sides of you brain.