If you are interested in learning more about ADHD, the first books/audiobooks I recommend are:
DELIVERED FROM DISTRACTION by Hallowell and Ratey
IS IT YOU, ME, OR ADULT ADHD? (about relationships - especially from the point of view of the non-ADHD partner.)
Dr. Ari Tuckman’s More Attention, Less Deficit podcast offers great short episodes.
Two websites with very good information are CHADD.org and ADD.org.
Self-Assessments
Online Adult ADHD test on ADD.org