Written in Teracom's signature "telecom for non-engineers" style, this book on its own is a great self-study guide for anyone wanting to understand the fundamentals of how radio works and how we actually communicate 1s and 0s using radios.
Without bogging down on technical details, you will understand the fundamental concepts and basics behind radio communications: the ideas, technology, jargon and buzzwords, and most importantly, how it all fits together.
CWA is three courses:
2231 Wireless Fundamentals (this one)
2232 Mobile Communications, and
2233 Fixed Wireless.