One resource focuses on children and teens; the other is for adults. Both can be remarkably useful for those with ADHD.
The first is understood.org (here) for “learning and attention issues.” What it offers is vast and, though, it’s targeted to parents of children and teens with ADHD, many adults with ADHD can find it of use. Much of what’s suggested for teens applies to adults, except for the context (e.g., work vs. school). Also, given that 25-35% of parents of youth with ADHD are likely to have ADHD (source), parents using the site may want to use the recommendations for themselves as well as their children.
The second resource is JAN, Job Accommodation Network (here), which is all about workplace accommodations for employers and employees needing or wanting to know what the American with Disabilities Act (ADA) encompasses, including job coaches…even the possibility of free ones. Who knew? From what I can tell, fewer than would have liked to have known.
I hope something here is of use to you.