A mind map is a thinking tool to organize your ideas into one simple design.
It can be used for any subject, not just memorising a book.
It acts like Note-Making rather than note-taking. It aims to summarise all your thoughts on a single page by way of using keywords, and adding simple images or drawings to make it more visual, so you can easily memorise it.
I think it would be best if you did a search on this on the forum, and perhaps purchase a book, or watch some videos on Youtube to understand it well.
Let me give you a quick example here to summarize the table of contents/chapters of a book, and the first chapter.
You basically start in the middle of a piece of paper as the title of your Book you want to summarise and memorise, and you work your way up by expanding it with curvy lines, and connecting each keyword to each other.
I like doing it with straight lines because I use my PC to create my mind maps, but if I was to do one by hand on a piece of paper, I use curvy and straight lines, just depends on the type of mind-map I’d be creating.
Here I’ve done a quick design of a mind-map for summarising a book chapters, and the first chapter to give you an idea of how I structure it.
This would probably be more effective if you did it by hand. Once you created a mind-map page, then simply put it into the beginning of the actual book chapter. And by spaced repetition you can memorise each chapter by going thru the mind-map you have created.
I once created “A Mind Map Of A Memory-Palace” to memorise the kings and queens of England. So it is also handy for creating memory palaces as well!