Read the book The Demon Haunted World: Science as a Candle in the Dark. Or better yet, listen to the Carey Elwes (Westley from The Princess Bride) read it on audiobook. It tells all about charlatans and conmen, and how to be skeptical and detect their bullshit. It’s the kind of book you can skip around in too, so it’s an easy read, not too weighty, but with lots of great info and stories.

Carl Sagan was amazing.