Generally, the books are good. Lot's of people say "I'm not a dummy, I won't buy it".
They're not for dummies. They're for people of all abilities.
My Music Theory for [Non] Dummies, 4th edition by Michael Pilhofer, MM?, and Holly Day arrived from Amazon, US$16.89
The first thing I did was grab my roll of masking tape and Sharpie marker and replaced "Dummies" with "Newbies". [Sometimes in life one must control the narrative]
The 2nd thing I did was my usual new book aroma test. Nothing like the smell of a brand new book; it passed.
The 3rd thing was to check the Table of Contents
Introduction
Part 1: Getting Started with Music Theory
Part 2: Putting Notes Together
Part 3: Musical Expressions through tempo and Dynamics
Part 4: Musical Expression Through Form
Part 5: The Part of Tens
Part 6: Appendicies
The 4th thing I did was read the Introduction. Some notable info:
1. Even the most basic music theory training gives you the information you need to expand your range and abilities as a musician.
2. This book is written for the following types of musicians (which, frankly, cover the gamut)
>> The absoulte beginner
>> The music student who drifted away
>> The experienced performer
The 5th thing I did was to check if it has an index, yep it does. And several pages show up under "Circle of Fifths" in the index.
There is also a link to online material containing chord progressions and other stuff.
So far I like it . . .