Note, if you are on a Mac, substitute `command` for `control`.

Shortcuts when in either _command mode_ (outside the cells) or _edit mode_ (inside a cell):
---
`Shift + Enter` run selected cells
`Ctrl + S` save and checkpoint

Shortcuts when in _command mode_:
---

Scroll up with the up arrow key.
Scroll down with the down arrow key.

`A` insert a new cell above the active cell.
`B` insert a new cell below the active cell.
`M` make the active cell a Markdown cell.
`Y` make the active cell a code cell.
`X` cut the selected cell or cells.
`C` copy the selected cell or cells.
`V` paste the cell(s) which were copied or cut most recently.
`DD` (D twice) delete the active cell.
`Z` undo most recent command mode action.

Shortcuts when in _edit mode_:
---
`Esc` takes you into command mode

`Tab` code completion (or indent if at start of line)
`Shift + Tab` tooltip help

The usual commands for code editors;

`Ctrl + ]`  indent
`Ctrl + [` dedent
`Ctrl + A` select all
`Ctrl + Z` undo