This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
I'd further suggest that you take a look at the FAQ for this forum. Visit the wickedlysmart.com site for errata & suggested solutions for the book. When you encounter any doubts, do a search on this forum or check up the specifications.