This site offers free downloads of an astral-cratering textbook by the site author.
Chapters: download a chapter at a time, or several at once. The chapters are arranged as any textbook, each builds on the understanding of each chapter before it. Even for a seasoned geologist it is a sharp learning curve, so be patient with yourself
Topics: are short articles on places or craters that the author has found interesting. As each of these papers were written after the book, you can go back to the book for items you don’t yet understand, or need to review.
You are welcome to contact the author with genuine questions. I am going to give you the best answer I know, and I only request you give them a fair chance till you learn the material.