>>775
I'm training as a TCM therapist. I can try to contextualize what you quoted a bit. But I'm sure the BO who is into Taoism will have things to say about the more esoteric aspects.
>Jing
This is what you would understand by "innate vitality". The life force you inherit from your parents and which is, in principle, irreplaceable. It's a measure of how old your body is.
>kidney yin
>kidney yang
As it says in the quote, these represent the function of the kidney in its yin and yang aspects (nourishing and energising). These are replenishable in a way, but if you tax them too much, you tap into jing. For example, if you expose yourself to more cold than you can withstand, you can empty your kidney yang (which warms the body indirectly by feeding the spleen yang), and start damaging your jing.
>kidney qi
Usually when talking about the "qi" of an organ, you talk about its functions. Keep in mind, the organs in TCM do not correspond to Western medicine physical organs. They represent bodily functions grouped according to Chinese five element theory.
>Kidney Qi plays a role in the Lower Burner's Body Fluids regulation. It also controls the opening and closing of these orifices. In the case of malfunctioning Kidney Qi, there will be urinary incontinence, diarrhea, spontaneous defecation while eating or spermatorrhea.

TCM is complex as fuck, really. But since it's not as literal as Western physiology, it provides good metaphors to understand bodily processes that would be too complex otherwise.
However, if you are interested in its more energetic and esoteric aspect, you should look into Qi Gong instead. Chinese medicine is very focused on the physical.

>>776
Armchair is all about reading and not practicing. There is nothing wrong with reading as long as you base your knowledge on experience and not interpretation of what you read.