Hello! I'm enrolled in PHY 1 in college and this is my first encounter with the subject. I'm usually able to derive the correct answers to the questions, but I consistently sense that I lack a firm understanding of what I'm calculating and or the justification of the steps involved. That concerns me. What books and or resources would you recommend for someone new to the subject who is seeking a firm conceptual understanding of the preliminary topics? I notice I learn best when the justification of the steps are explained to me while I'm solving the question. As I hinted in the earlier question, please offer suggestions for a beginner. I'm extraordinarily ignorant (especially on this subject) and anything complicated would probably further confuse me. Sources and advice are appreciated!