I did my certification with Transform Destiny and their online course ($197) and topped up with a few Udemy courses about past life regression, etc. It'd be dope if you used this link if you booked with them :) Will give me a little commission.
If the budget allows for a bit more, I'd recommend the NLP Master course, hypnosis and other techniques will be included.
Udemy has great courses by Kain Ramsey (stay away from Karen Wells) and Mark Beale when it comes to hypnosis. All at $10-20. Some with certification.
RTT is a very successful and sought after form of hypnosis
Most legit, but also longest and most expensive:
Past life regression and Life Between Lives:
Google Dr. Brian Weiss and Dr. Michael Newton
Recommended course on Healing Hypnosis: David Lion
Connect with your host Jennifer Schlueter at:
Inquire about 1:1 hypnosis & breathwork coaching to unlock your magic with Jennifer: https://calendly.com/jenniferschlueter89/15-minute-hypnosis-consultation