I've blogged about my theory that you can appear to be an expert, at least to non-experts, on any topic for which you know the twelve basic concepts. Someone suggested I write a book with lots of topics and their twelve concepts. I like that idea except you would need about a hundred topics to make it work. I could only come up with 25 topics. What other subjects would you want to know at twelve concepts about? Or to put it another way, what topics do you wish OTHER people understood better?
Buying a car
Building your own home