It's geared a little more towards childhood ADHD, and it's quite long (I needed to be medicated in order to watch the whole thing, of course..) but this Dr is a fantastic expert on the topic and doesn't hold back on explaining the disorder in clear medical terms. He also does not sugar coat anything or tell you what you want to hear. It's a very pragmatic and thorough explanation of what ADHD means, and really opened up my eyes in many ways.
One of the important takeaways from that lecture is that ADHD is not simply attention problems, there are a myriad of related issues with executive function that are just not as apparent. Learning that ADHD is more than attention can fundamentally change your coping strategies. Well worth investing time into deeper education