First, learn to operate your "hardware" efficiently.
Look into NLP (Neurolinguistic Programming, it gets some crap for being pseudo-scientific, which is not entirely undeserved, some NLP folks play fast and loose with science.) I recommend this book, but there are others: https://www.goodreads.com/book/show/3803577-get-the-life-you...
Also, investigate self-hypnosis. The biggest mistake people make is trying to think with only their conscious mind.
Next, what kind of learning? Most of what you're talking about is "little stuff", really. Learning on the level of values or identity is much more powerful and far-reaching than picking up a new habit or skill.
Levels of learning, from most profound and general to most specific:
identity
values
beliefs
capabilities
behaviours
Fun stuff:
"Programming and Meta-programming the Human Biocomputer" John C. Lilly (YMMV)
"Psycho-cybernetics" Maxwell Maltz This is based on self-image modification. Dr. Maltz was a plastic surgeon who noticed that some people had profound psychological changes from cosmetic surgery while others didn't. Upon investigation he discovered that the difference was whether or not the external change in appearance affected their internal self-image. The surgery was a (hellof a) way to effect change in the patient's self-image. So he started teaching people how to do that directly, so they didn't need the cosmetic surgery.)
"Super-learning" Ostrander, Schroeder, & Ostrander Old but interesting stuff.