This book explains well difficult concepts and gives many questions with guided solutions to practice. It's very good if one studies calculus or prepares for AP exam.

Good explanation and helpful worked examples😀

Chapter on planet orbits really helped me with my studies

Better than lecture notes, helps me to summarise everything I need and have some structure

Great notes with detailed and step-by-step solutions. Lots of diagrams. Cheaper than most textbooks with more comprehensive examples.