I think any subject that encourages someone to be a better version of themselves is worthwhile and it interests me. I am always trying to learn ways to be healthier body/mind/spirit and I have a natural curiosity that makes me want to try new things. I have greatly improved my life with many self-help techniques. When I was learning meditation for example, I would often use guided meditations or self-hypnosis recordings to relax.
I am a firm believer in Universal Laws - not the mainstream "secret" that distorts the laws into materialism as much, but the truer versions that focus on self-awarness and empowerment that sort of thing.
I also love natural health topics, nutrition, alt medicine etc.