From most non-fiction books, you need only a total of one or two pages-worth of key-knowledge or know-how.
Of course it's wise to skim through the whole contents first; and also wise to ensure you have an adequate 'foundation' and 'basis' inside of you before going in further, deeper, higher', or "more in keeping with my age and position in the world".
So it is with most 'levels', 'intensities', 'extensities' and 'proliferations' of knowledges and know-hows contained in a book.
With List 1 below, the reader should find it easy to find and use the guidance he or she needs.
With many 'longer' books, one is faced with a probable Course of learning,
such as with Linda Hartley's both practical and profoundly factual work, also useful for one to reclaim one's natural-movement potential Wisdom of the Body Moving - one would need to start-at-the-very-beginning and 'master' the infant's first self-moving task of "cellular respiration" [or "cellular breathing" as Linda prefers to say]; and since one has already had to grow-up often only 'sketchily' through the successive stages of human 'self-movability', one then needs to go into the "navel-radiation" stage all over again; then the "mouthing movements"; then the succession of major spinal-movements, crawling, all-fours, standing and walking, 'homolaterally' then 'hetero-laterally' ...
Your Body: is also manifoldly 'encyclopaedic', but is not essentially best-learned as a "course" but as a range of body, emotions, energies, and mind-functions 'self-explorations'; - especially using of your Imagination's abilities and self-bio-feedback from literally 'hundreds' of different body-part instructions for 'micro-self-explorations' ["exercise-instructions" such as "Whilst siting in your chair, take a rest, close your eyes, and imagine yourself lying comfortably on or in your bed, and breathing easily, able to move easily too, and to 'draw up' your knees and have the soles of your feet flat on the bed --"; let this take a few minutes, go back to your book or TV watching, knitting, or whatever; after a while, rest again and imagine being on your bed again for a few minutes. What was your mind doing doing all of that ?.
"Now next time you "have a little rest or nod-off, actually go and lie on your bed and draw your knees up. " --------------- Maybe jot into a day book, diary or journal, what you did, how you felt, what you thought; any other thing or thought that came to you.
Relaxercise by Bersin, Bersin & Reese; The Centering Book by Hendricks & Wills Holistic Living by Patrick Pietroni Your Body: biofeedback at its best [without instruments and machines ] by Beata Jencks.