Every Key of Draw

The keys of the Draw tool. While drawing, the keys that act at the current moment are listed at the bottom left of the viewport; F1 shows every key, and again hides the list.

Putting Down a Guide

Key	Action
F and drag	Draws a freehand curve. Returning to the start makes a loop; starting from a point or a line glues it there. Space moves the shape while dragging.
LMB	Places a sharp point with the pen. Click and drag places a smooth point with a handle.
LMB on the first point	Closes the pen's loop.
LMB on the last point, Enter	Finishes the pen's line open.
Backspace	Removes the pen's last point.
L and drag	Draws a straight line.
O and drag	Draws a circle from its center. Shift makes it round; Space moves it.
Drag off the mesh	Cuts through: a guide where the stroke slices the mesh, on the front and the back.
LMB off the mesh	Cuts through with a line, point by point (two points make it straight). Enter cuts.

Selecting

Key	Action
LMB on a guide	Selects it. Shift extends the selection.
LMB on a point	Selects the point and its guide.
L and click	Selects the guide and every guide glued to it.
A / Alt+A	Selects all / none.
LMB on bare mesh	Deselects.

Points and Handles

Key	Action
Drag a point	Moves it. Shift slides it along its guide. Released on another guide, it is glued there.
Drag a glued point	Moves the junction; the other guide bends with it. Ctrl or Alt and drag pulls it free.
G and drag a line	Moves the whole guide, or the selection.
G / S / R (tap, with a point selected)	Moves the point / scales its handles / turns them. A click or Enter confirms, Esc cancels. Ctrl while turning gives 15° steps.
V (tap), or V and click	Makes the point sharp or smooth.
P (tap, with an end selected), or P and click an end	Cycles a line end that meets nothing; see End a line that meets nothing.
Drag a handle end	Bends the curve.
S and drag a point	Scales its handles.
H	Shows or hides the handles on every point.
Ctrl and click a line	Adds a point there.
Ctrl and click a point	Deletes it.
Ctrl and wheel	Gives the guide fewer or more points.
Alt and click two points	Makes a guide between them.

Guides

Key	Action
E and click	Erases the section under the mouse.
X and click	Deletes the guide.
Del	Deletes the selected guides.
R and drag	Relax brush. The wheel sets its size.
T and drag	Tweak brush. The wheel sets its size.
Shift+R	Relaxes every point of the selected guides.

Regions

Key	Action
K and click a region	Cycles the region's kind; see A region's kind.

Mirror X

Key	Action
M	Turns Mirror X on or off.
Drag an end onto the mirror line	Merges the guide with its mirror image.
Drag a center point	Slides it along the line. Ctrl or Alt and drag pulls it off; the guide opens there.

The Tool

Key	Action
Ctrl+Z, Backspace	Undoes.
N	Shows or hides the sidebar.
F1	Cycles the key list: the keys for now, every key, hidden.
Esc	Cancels the action under way; with nothing under way, leaves Draw.