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The biggest problem with learning piano as an adult is not a lack of material. There are thousands of YouTube videos, apps, and books. The problem is fragmentation: picking up five different methods at once, hitting a wall on hand independence, relying on visual memory shortcuts, and stalling out after six months.
This guide synthesizes the widely respected music and sight-reading roadmap originally created by Reddit contributor MrScarletOnTheMoon, paired with insights from piano teachers and adult learners on r/piano. The linked online lessons, drills, public-domain scores, and Playsheet practice pieces are free to access; some companion videos correspond to commercial method books.
Sight-reading is a completely different skill from learning repertoire. When practicing repertoire, you stop to fix mistakes. In sight-reading, you must never stop. The goal is to keep the pulse moving forward no matter what.
Connect what you hear to the physical keyboard. Start by identifying interval distances (e.g. Major 3rd vs. Perfect 5th), distinguishing Major from Minor chords, and figuring out simple melodies (like folk tunes or nursery rhymes) entirely by ear without sheet music.