I'm pretty new to Mac OS X. I've been supporting Windows environments for the past few years but the learning curve has been super easy. I've been working with Mac OS X lately at work so that I can better support it and was given a Macbook for work use. A co-worker gave me his old Apple Training Series textbook for Mac OS X 10.6 Snow Leopard. My work laptop is on Yosemite. Is it worth it for me to read through this old book or can I still pick up any valuable information?