Mindmapping is a very useful technique to capture, organize, understand and create ideas/concepts/thoughts in a graphical and flexible manner. The main asset of mindmaps is that they allow you to build a global picture of a topic, individually or collaboratively, while making room for creativity: each idea/key word can branch out into as many other ideas and keywords as needed. Minmaps are a great tool for brainstorming for instance but also for organizing ideas on a complex and extensive topic/problem.
There a lot of Mindmapping tools and communities on the web, as for example:
In this course, a free and collaborative mindmapping tool will be used during specific sessions in order to collect, share and converge knowledge on specific course topics.
You can have a look at several video resources describing how to work with mindmaps: