I've been known to delve into many curious nooks and crannies in my lifetime and I must confess that when I was younger I signed up for a 3 evening course of astrology. The first night was enough for me. Never could bring myself to go back the second evening.
Oddly enough, it wasn't what was being "taught" so much as the attitude of the teacher and students that put me right off. When I asked a couple of what I thought were valid and reasonable questions, the teacher got a bit hostile and the other students shunned me as if I was just a trouble maker.
No one was there to ask questions. Just to believe.

Looking over some of the titles in my library, I ruefully admit to the following;
Digital Photography for Dummies
Windows XP for Dummies
The Internet for Dummies
and yes,
The Idiots Guide to Astronomy!