Click on the white canvas to create a point. Click on an object to select it. Depending on the objects which you have selected, different options will appear below.
Hold down M to move the currently selected point using your mouse cursor
Deselect All
Hotkey: Ctrl+D
Delete All
Hotkey: D
Midpoint
Hotkey: Ctrl+M
Parents
Hotkey: P
Rename Point
Hotkey: R
Segment
Hotkey: S
Line
Hotkey: L
Perpendicular between Line and Point
Hotkey: P