Essential Concepts: Harmony & Theory | Music Book for Guitar and Multi-Instrument with Step-by-Step Concepts for Students | Learn Intervals Scales ... (Essential Concepts (Musicians Institute).)
by
Keith Wyatt, Carl Schroeder
ISBN: 0793579910
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https://www.amazon.com/Harmony-Theory-Essential-Musicians-In...
I went through a lot of resources and this is the one that worked for me.
My advice would be to pick one good source, stick to it, and spend time to learn the material. It's easy but one has to devote some time and work. Use a pen and paper, do the exercices, be focused.