Tao Te Ching is divided in two great sections: the Book of Tao, and the Book of Te. (In a version discovered recently this order is reversed.)
Its summary includes the most known Taoist topics such as tao, te (power, virtue), wu (emptiness), wu-wei (nondoing), fu (return), and so forth.
Generally speaking the content of the book is made of short essays approaching the characteristics (te ) of Tao - the creator and sustainer of everything in the Universe - and the method of following the Tao which is the supreme goal of Taoist adept.
Therefore, one must know the basic Taoist concepts in order to understand the meaning of these essays. For example, the word "tao" itself stands for several meanings, such as: great originator of everything in the universe, way or method, speech (logos), and so forth. One should consider all of these meanings in the given text to understand what is about.
Thus "tao" can lead one to the idea of the very beginning of the Universe or to the method of following the Tao, or to any method or technique of doing something special ("skill", such as a good archer or teacher and so on).
The same with wu and wu-wei. Wu stands for emptiness (void) - the emptiness of the great beginning or the emptiness of the mind (acquired through meditation) which is the goal of the Taoist adept.
Wu-Wei is nondoing or doing without doing - another basic concept hold dear by Taoist adepts.
◦ ~~~ ◦ http://www.with.org/tao_te_ching_en.pdf ◦ ~~~ ◦
Full text of "Understanding Reality":
A Taoist Alchemical Classic by Chang Po-tuan With a Concise Commentary by Liu I-ming Translated from the Chinese by Thomas Cleary
non-illustrated web archive format: https://archive.org/stream/UnderstandingReality_201605/Cleary-Thoma...