I was fortunate to have piano lessons when I was a girl. In Canada, if students are learning classical music, teachers usually follow the Royal Conservatory of Music progression from grades one through ten and utilize the books for each level. These lessons include theory as well as musical scores for students to progress in.
Very early, I decided that classical was not my preference, and, after I’d completed four grades of the Royal Conservatory program, I convinced my mother to send me to a teacher who could help me learn pop tunes. That involved learning how to chord so when I used sheet music of popular songs, I only had to read the right-hand score, improvising with my left hand using chordal variations.