Google Sketchup - Using the rectangle, push up/down, navigation tools.
Press the trackpad on the shape you want to push or pull into three-dimensional form.
Click then push or pull the shape as desired. Click again.
Enlarge the object as much as wanted. Add more structure.
Play around with adding holes, windows or other elements by cutting out shapes within the 3D shape.
Make the rectangle/square as desired.
Click and enlarge the shape by using the trackpad.
You press wherever you want to move the frame to the point of view that you desire.
You can use this tool to zoom in closer.
This tool will help you to view around object and see how it look from all sides and view what you may need to edit.
Zoom Extents: is the first of view of the object/model for more explanations it’s like a view showing the object from the view of top to bottom to be fit to the screen size.
Google Sketchup - Using the pencil, move and eraser tools
Pencil: WHile using the pencil you can form lines wherever you might desire.
Move: its when you use the pencil to move the line up/down with the move tool.
Eraser: is to erase lines/objects/shapes to edit it when it’s erased