yea Ryan Kurczak is the only really good Kriya teacher on youtube; he has an 11 hour free course on youtube about how to do kriya yoga and meditations. I believe he does Vedic astrology as well. Kundalini is harder to come across decent ones, many are heavily westernized. For kundalini, i like to watch exercises on gaia.com, the videos there are from many teachers who were taught by Yogi Bhajan himself, although be wary, since he did, as Leo put in his yoga video, create many rules and "dogma". Another thing i find strange is that Yogi Bhajan died rather early, age 75 because of congestive heart failure. According to his school of Yoga, there is a Kriya for every health issue, like heart problem, thyroid problem, etc, so how did he die of a heart problem?