For the most part, the economic ideas I write about here isn't stuff you'd learn in an intro class or even an intermediate class. These ideas do, however, rely on the ideas taught in those classes. I considered writing up a series of tutorials, but there are actually pretty great materials that already exist. Here are the ones I'm particularly found of
For learning introductory economics, I recommend the Academic Decathlon Economics Guide. It spends 46 pages on microeconomics and another 46 pages on macroeconomics, covering pretty much all the important things you'll learn in these two introductory economics courses.
To take your economics to a higher (more mathematical) level, I recommend reading/watching Policonomics' learning paths.