To avoid looking at tutorials on a screen and if money is an issue. If you've got basic things like pen and paper. Drawing/doodling is a great place to start. Doesn't matter if you don't think it's good, just experiment.

You could try things like writing (especially if you're struggling with mental health issues) whether that be a sort of diary or wiring a story that tries to explain your feelings/struggles. My therapist actually recommended this to me and I found it incredibly helpful, especially as someone who has always hated writing. You can tear it up afterwards as well.

Knitting/Crochet is probably a little more than expensive, especially getting the tools, but is really good for giving your brain a break and falling into a rhythm.

Gardening, sounds odd, but you could buy some seeds for very little and try growing some things. It'll be slow, but it will get you outside and it's been proven to help improve mental health.

Walking without music. Just focus on your senses and what your seeing. Can be a great way to get your mind free of anxieties and stresses.

Puzzles - it's an activity that will also keep you busy and also isn't too strenuous.

Wood carving/whittling