Placing Objects:
1. Select an object from the sidebar
2. Press Arrow Keys to rotate
3. Press +/- to scale
4. Click to place in the world
Editing Objects:
5. Click placed objects to select them
6. Use Arrow Keys to rotate selection
7. Use +/- to resize
8. Press Delete to remove
Camera:
9. Drag to rotate camera
10. Hold Space + drag to pan
11. Scroll to zoom in/out