Type # then a space to make a line a section title. Tab at the start of a task indents it into a note; Shift+Tab promotes it back.
Click the circle to cycle open → done → for review → abandoned. Marking for review adds a follow-up note underneath.
Drag the grip on the left of a line. Dragging a title moves its whole section with it.
Copies everything not done or abandoned, grouped by section, ready to paste into a status update.
The disk icon saves to the remembered file, Save As always prompts, and the folder icon opens a file into a new project. Autosave writes to the remembered file on a timer once one exists.