Keyboard shortcuts

Move

j / k	Next / previous row (a number first repeats: 5j)
gg / G	First / last row
h / l	Previous / next day, week, month or year on views that page
t	Back to today
Tab / Shift-Tab	The page's own switch: Today / Next two weeks, Today / This week, the project chips on Tasks, the lists on Lists, Edit on Goals
! @ #	Tick the page's first, second, third checkbox option (on Tasks: No do day yet, Hide blocked, Show completed)
Ctrl-p / Ctrl-y	Next / previous tab; 3 then Ctrl-p jumps to the third tab (Overview is 1, Month is 9)

Act on the highlighted row

x or space	Tick / untick (tasks, list items, goals)
Enter or o	Open it (the row keys keep working while the panel is open)
dd	Delete it (tasks with their subtasks, events, list items)
u	Undo the last delete
r	Move an overdue task to another day
z	Collapse / expand subtasks

Create and close

a / A	New task / new event
i	Open the highlighted row with the cursor in its title; with nothing highlighted, go to the page's add box
jk	While typing: leave the field. In the panel, j/k then move between rows of fields and h/l along a row; Enter or i goes into one, x ticks it
w	Switch j/k between the page and the open panel
'w Enter	Save the open task or event and close the panel
in a dropdown	j / k step through the choices; Enter, Esc or a quick jk leaves it
Esc	Close the panel, or clear the highlight
?	Show / hide this sheet