Luc Desfosses created the CISSP Work Notes, a page on which he documented everything he encountered while studying for the CISSP exam for six months.

This page provides CISSP candidates with information on how to study for the exam, covers fundamental concepts, and includes an index of IT and cybersecurity acronyms and abbreviations, as well as definitions. 

Another good free resource if you need a quick reference or review before taking the exam.

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