Disclaimer: Always verify that your study materials apply to your local aviation authority (EASA, ANAC, etc.) as regulations vary, but physics is universal.
Whether you are studying for your Private Pilot License (PPL), preparing for an engineering exam, or simply an aviation geek who wants to understand how a 500-ton metal tube stays up, you need solid study materials. But textbooks can be heavy (and expensive).
Once you grasp how a wing creates a vacuum on top, you will never look at a plane the same way again.