Click on object - show the correspondent Object Settings panel.
Click and drag object handle with Shift-Option(Alt) keys pressed - proportional resize with centering object.
Click and drag object handle with Shift key pressed - non proportional resize.
Click and drag object with Shift key pressed - move vertically or horizontally.
Rotation of object with Shift pressed - rotation by 45 degrees.
Click and Drag object with Option(Alt) key pressed - duplicate object.