Ask HN: What uncommon/unusual knowledge has improved your life, positively?

My mother has been experimenting with bach flower remedies. I was quite skeptical at the beginning, but now that I have seen it working (it works very well, at least for the cases I saw), I now have more of an open mind.

Which brings me to the question - what uncommon, unusual, little known knowledge that you possess, that improved your life positively? This can be anything from health, exercise, healing methods, mental aspects, food, learning... anything. I understand the question is very broad, but I think it is still a valid thought to ponder.