When I was first recommended meditation, I resisted like there was no tomorrow. To me it sounded like something only super anxious people had to do. However, once I actually started doing it, I realized the importance of meditation, not only in general, but also to people who have ADHD.
Meditation is a way for you to calm yourself and let your mind empty/wander while simultaneously staying focused. Although I have my own personal anxieties, I have noticed it has been helpful in overall calming my mind in terms of how fast my thoughts are moving. Individuals with ADHD tend to think very quickly, to the point where it can be difficult to organize their thoughts. Trust me, I've been there. But with meditation, you get the opportunity to slow down a little and gather your thoughts into a more organized manner.
It only takes around 15-20 minutes a day. I know the thought of sitting down for that long sounds inhumane (I know I thought I wasn't going to be able to do it), but once you get into it it actually feels quite relaxing.
Here are some meditation apps that I have found helpful: