For those who like workbook-style exercises and using pencils and staff paper, I highly recommend "Practical Theory" by Sandy Feldstein: https://www.amazon.com

For those who like workbook-style exercises and using pencils and staff paper, I highly recommend "Practical Theory" by Sandy Feldstein: https://www.amazon.com/gp/product/0882842250 https://www.amazon.com/gp/product/0882842250 I've been teaching myself classical piano from scratch (with a very good human teacher and weekly lessons) throughout the pandemic and this book has been a huge help for supplemental information and just getting me in the habit of marking up staff paper.