Download the file called SmallBuilding05.zip from the FTP site onto your hard drive.  Unzip the file and double-click the HTML file to run the video in your browser.  

Learn this process and then apply it to modeling challenges that come your way during production.  Don't view it as simply a way to create roofs, but use the technique to create café tables, light fixtures, lighthouse towers, columns, and knobs on the control panel, just to name a few possible uses.  

Good luck and have fun
Ted