I first started to mind map in 1991 when I picked up a book by Joyce Wycoff: Mindmapping Your Personal Guide to Exploring Creativity and Problem-Solving. Mindmapping is a technique for idea organizing and was fist developed in. 1975 by Tony Buzan.
I have used this technique in my business career and in my painting. I have found this to be a really helpful tool in generating ideas or in narrowing down ideas for a specific painting. For the drawing on the right, I started with a single theme of memories and mindmapped things that suggested memories to me.
Below are some videos on how to mind map.