Drawing for Woodworkers
https://sites.google.com/aceraschool.org/engineering-design/sketching

Beginner

• Navigating with pan, orbit, and zoom; and why you should get a mouse
  Going over three key tools for navigating efficiently

• Mastering SketchUp selection with single, double, and triple clicks
  More than meets the eye with the humble select tool click.

• How dragging to the left or right affects your selection
  Dragging to the left or right will get different results. Don't get confused.