First SketchUp tip: left-to-right vs right-to-left SELECT window
I learned from Bob Lang’s DVD that if you use the SELECT tool by dragging a selection window from left to right across parts of your drawing, the program will only select the parts of the drawing that are contained within the window that you are dragging. If you use the SELECT tool from right to left, the tool will AUTOMATICALLY select all of the parts and faces of the object even if you only enclose part of it in your window.
On complex drawings, I have found this to be very useful. It helps you to select an entire object without accidentally overlapping and selecting its surrounding and interconnecting objects. Cool.
This is the kind of SketchUp technique that I think I would never discover from trying to learn the program entirely on my own. Trainings aids, DVDs and books are required to fully unlock the capabilities of the program.