Generate a full detail guide on the 'Mind Mapping' technique for brainstorming. The guide should be practical and visual. It must include: 1. An explanation of what a mind map is and its benefits for non-linear thinking. 2. A clear, step-by-step tutorial on how to create your first mind map, from the central idea to the main branches and sub-branches. 3. A list of different uses for mind maps (e.g., outlining a novel, planning a project). 4. A review of 3 popular digital mind mapping tools. Please include a supportive disclaimer.