I am new to the classical guitar, and aside from those obligatory trumpet lessons in middle school, I am new to music. However, now that my kids are busy with high school, I am keen to learn, and have an hour each day I can devote to this pursuit.
Aside from Lawrence McDonald's very excellent "Conservatory Tutor" set (I've been studying the first few pages to get a feel for his philosophy of use and am very impressed)... and I have Sagreras book one for exercises.
I have this insatiable curiosity, (a compulsion even) to understand both the "how" AND the "why." So... Another help I picked up was "Music Theory in One Lesson" by Ross Trottier. He also has some corresponding videos on his YouTube channel (Ross the Music Teacher) that seem quite helpful.
However, my dilemma is that (as good as Trottier's work is) I am a bit lower on the developmental scale than that. Can you recommend a resource that breaks music theory down "Romper Room Style," so that even a child can grasp the basics? I am not intimidated by my lack of knowledge (I cannot speak Portuguese either, but I know I could learn it), nor will I be offended at a resource designed for a 9-year old.