Underlining keywords with different colors isn't just important to more effectively pinning the most meaningful information into your mind. In fact, it will also be very useful for the next step: "training" your mind to make connections between the concepts of greatest importance .
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You could then get anxious to report an enormous amount of information in mind maps, so much so that you run out of space on the sheet!
Many fall into this mistake, but remember that the purpose of mind maps is not to put the entire book in the form of a map, but to help you better assimilate the topic and stimulate your memory.
Not sure how to make an effective mind map? Then read the article in which Andrea explained the difference between mind maps and concept maps.