Rundown

It's simple. You get a rich-text editor where you can structure tasks however you wish.

On a blank line, type a dash "-" followed by space to create a new to-do list. To create a regular list, type an asterisk "*" followed by a space. For headings and bold/italic text refer to the Markdown syntax: https://markdownguide.org/basic-syntax

You can recap your work and see a split view of the tasks you've currently done and the ones remaining. Then, you can filter your document and leave just undone tasks.