Draw a shape proportionally with the Rectangle, Circle Shape, and Mask tools

Shift-drag in the Canvas

Draw a shape from its center with the Rectangle, Circle Shape, and Mask tools

Option-drag in the Canvas

Draw a shape proportionally from its center with the Rectangle, Circle Shape, and Mask tools

Option-Shift-drag in the Canvas

Cancel spline drawing and delete the open spline

Escape

Exit spline drawing mode and complete the existing spline drawing

Return

Add a point to the path

Double-click a path

Add a point to the path

Option-click a path

Convert a point to linear

Command-click a Bezier point

Create tangents on a point

Command-drag a Bezier point

Scale tangents proportionally

Command-drag a tangent handle

Adjust a B-Spline point bias

Command-drag a B-Spline point

Switch a B-Spline point bias

Command-click a B-Spline point

Break or relink a tangent handle

Option-drag a tangent handle

Constrain a tangent to 45 degrees and original value

Shift-drag a tangent handle

Convert a simple shape to a complex shape (with editable control points)

Option-Command-B