perhaps blasé, but the Tao. it is as simple as it is unknowable, from the highest levels of philosophy down to action-items in your everyday life. the Tao that can be described is not the true Tao, so you must search yourself :)
to simply be smarter (but maybe not wiser), the art of learning by josh waitzkin. if you are interested in optimizing anything, why not learn how to optimize optimization?
I wonder if the Tao is so profound as it is interpreted in the West, because the understanding of the text, much lies on the nature of the Chinese language, which is much more about concepts, than about words. For example, the 'the Tao that can be described' part in Chinese consists of only three characters, which when transliterated would read 'way can speak', where for both 'way' and 'speak' the character for tao is used. The remaining part of the sentence also only uses three characters, if I am not mistaken 'not constant(timeless, eternal) way'. See for example: https://www.tao-te-king.org/
to simply be smarter (but maybe not wiser), the art of learning by josh waitzkin. if you are interested in optimizing anything, why not learn how to optimize optimization?