The best technique for creating mind maps for UPSC topics involves starting with a central theme, usually the subject title, and branching out into key subtopics and concepts. Use colors and symbols to differentiate ideas and establish connections, enhancing memory retention. Note down essential facts, dates, and definitions in concise phrases. Reviewing and updating the mind map regularly can reinforce learning. Engaging multiple senses while creating the map, such as writing and visualizing, facilitates better understanding and recall, making it an effective approach for UPSC preparation.