This is a great book for learning more about autism as a parent or as a guide for teens and young adults.
The first several chapters are a good overview on many topics. If you are learning about a new diagnosis I really recommend the first 90 pages. I especially appreciate (and was agreeing out loud) with points made about gender and race and how so many people were overlooked by the medical community for such a long time. The discussion of language and also disability are helpful starting points as well.
Later sections of the book talk about navigating education at many levels, transitioning to college or a job, managing living situations, health care, and so on. This would be really helpful to young adults considering some of these steps. (In fact, a practical look at how to think about choosing where to living or thinking about career paths would be great for any young adult.)
The author is based in the UK, so many of the education or health care situations are specific to the UK. Aside from that, the book is really approachable and written by an autistic adult in her 20s, so the suggestions seem like they would be a helpful roadmap to young adults approaching big transitions.