OS X Yosemite Security and Privacy Guide
This is a collection of thoughts on securing a modern Mac running OS X Yosemite and some steps on how to improve privacy. It is targeted to “power users” who wish to adopt enterprise-standard security, but is also suitable for novice users with an interest in improving their privacy and security on a Mac. There is no security silver bullet. A system is only as secure as its administrator is capable of making it.