I'm relatively new to researching the more esoteric/conspiracy stuff, but I'd like to change that. I keep coming across references to symbolism in secret societies, ancient beliefs, etc. Owls, Y heads, Templar, and a whole bunch of other things like that. I find that kind of stuff fascinating and I'd like to go down the rabbit hole, so to speak, but I have only found watered-down, high-level books "debunking" this or that, like "oh of course these Societies are obsolete and hold no power now," which of course is ridiculous.

Can anyone recommend some good books or videos to jump into the subject of secret societies, occult symbolism, or anything related? Thanks!