editor
Typing
↵ starts a new line below — or above, if the caret sat at the very start of the line
Tab tucks the line under the one above it; Shift+Tab pulls it back out
Backspace on an empty line removes it; at the start of a line it merges into the line before
two dots in a row split the line at the caret — handy for cutting a sentence in half
text commits half a second after you stop typing, and immediately when you leave the line
Moving the caret
↑ and ↓ step between lines rather than within one
← at the start of a line steps to the element before it, and folds the line once there is nowhere left to go
→ at the end of a line does the mirror image, and unfolds
Rearranging
⌘J or ⌘↓ moves a line down among its siblings; ⌘K or ⌘↑ moves it up. Ctrl works in place of ⌘
drag a row by its bullet: the top or bottom quarter of the row you drop on puts it above or below, the middle puts it inside
Roots and panes
⌘↵ makes the current line the root of this pane
⌘⇧↵ opens it in a new pane beside this one
⌘/ hides and shows the sidebar
Undo
⌘Z undoes, ⌘⇧Z or ⌘Y redoes
creating and deleting undo cleanly; renaming does not undo, and a create cannot be redone once undone
Working on several lines at once
drag downwards over the blank right-hand side of the rows, or ⌘-click rows one at a time
a small menu then offers to copy them as a Markdown outline
when the selection holds elements it also offers a picker: tick the ones you want and build a new set from them, as a root or in a new pane
On a phone
while a line is focused a toolbar rides above the keyboard: outdent, indent, move up, move down, done
controls that a desktop reveals on hover are simply always visible
Saving
there is no save button — the cloud in the top bar tells you whether everything has landed
closing the tab with unsent changes asks you to confirm first