Google (or the library) is your friend. It's not a secret.
Seriously: if you want to learn thermo., take a college degree in Chemistry or Physics. We spend a semester teaching Chem. Engineering students about thermo.; they're by-and-large the smartest kids in the university (and don't they know it) and they've had a lot of background, including 3-4 semesters of calculus. You can't pick up what you need froma biblical tract.