I want to try psychedelic drugs because their effects ts on the mind seem ver cool and interesting, and they can offer very deep insights into one's mind, the ones I know are LSD, shrooms and DMT, even though in don't know much about them.

What are their effects?
What should I know and do before i try them?
How do i know that I'm not being sold cut/fake drug when I buy it? What precautions should I take? What are the differences between the various psychedelics?