As much as possible, you should struggle with the book independently on a first pass. This will help you see the forest for the trees, rather than getting mired in minutiae. When you use an external resource, understand 1) what you hope to get from consulting it, 2) the limitations of the resource. — Commentaries/reviews Best to avoid these until after your read-through. Otherwise you’ll start the book biased and focus on things that support the commentary.
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How to read a book,by Mortimer Adler
When you read a book, do you find yourself forgetting what you read? Do you regret wasting time on books that you should have skimmed instead?