Welcome to Dash @Andahay .
The documentation on Dash button and Dash checklist is pretty comprehensive. You can also see these tutorials I made on checklists and button components. Those things explain the basics. I’m sure after your read the documentation or see the vidoes, you’ll get a solid understanding of how theses components work.
Thank you for videos, they were very useful. But i stil got my problem. After running my app i got an error unhashable type: ‘list’. I can’t understand there is the problem
P.s. i’ve already read the documentation for both components and sending the list of strings, as it should be