I have ADHD and this is some of the hobbies that I find helps met focus and just relax my busy mind a plus point is that it's super easy to do them with videos.
Crocheting helps a lot with anxiety, creativity just relaxing while making something super cute.
How to Crochet for Absolute Beginners: Part 1
Drawing has always been a way for me to relax even if it's just a flower here and there but it has always brought a sense of calm to me
Pencil Drawing for Beginners - Fine Art Tutorials
Origami can be so easy especially to keep young children or even adults occupied for some time. Origami has a calming effect to it if done right.
How To Make Easy Origami - Origami Guide
Painting helps me reset after a long week. For those people who are not good at drawing often paint because you don't need to be precise