I second hidden order as a great introduction to microeconomics. If you're a true beginner, read that first and THEN jump into a textbook with math.
I also second everyone suggesting that you avoid macro for a bit until you understand micro. Macro seems to have much less settled theory than micro.
I would like to learn more about economics but I don't know where to start. Can lesswrong suggest specific areas of economics that are particularly useful for understanding and optimising the world? Specific suggestions such as reading lists and resources would also be much appreciated.