The range of yoga related material is extensive some good, some excellent and a lot of it confusing somewhat convoluted and in fact pieced together to provide pablum for the western mind and consumption.
I don't think I want to be specific about the various offerings but simply comment on a few components I find useful and interesting.
- approximate headings, but not quite defined:
 - I will divide my comments and suggestions as follows:
 - Hatha Yoga, Palate, Breathing, meditation and more
 - Other forms of Yoga (styles, types)
 - Useful ideas, yoga , related with a western twist...
 - Chakras and the Kundalini yoga (Indian, Tibetan, Chinese and other forms of yoga)
 - Western medicine, lifestyle diets and more, see Barbara O'Neil
 - Qi, Tchi and all that good stuff ( patting and exercises and the energy ball or bubble)