I never learned technical theory. I was a band geek in Jr High and HS, so I did learn a little bit about following the bouncing black dots on the page. Time signature. Kinda what key we were in. When to play. When not to play.
But my take on reading music with us common folk is that if you can look at a page of music. Know that when the notes go up you sing/play higher and the opposite when the notes go down. While you may not know the name of the note. You may not know what key you are in….. in your own way, you are reading music. Just not reading music like a trained pianist reads music.