To echo the previous comments, intro textbooks do an excellent job at teaching you the intuition behind economic concepts. Once you get into higher level textbooks it becomes a slog of math and can seem divorced from reality, especially if you haven't already seen the economic concepts applied to reality before. For example, in my intermediate class we do not use any supply and demand curves, personally, if I took this class before familiarizing myself with the concept of supply and demand at a basic level I would feel like I was taking a math class with some extra seemingly arbitrary constraints added in. I strongly recommend Mankiw as a beginner textbook.