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Most piano resources are useful on their own. The hard part is knowing what to do next. This guide turns the original sight-reading chart into one practical path from beginner reading to intermediate playing.
Pick one main course. Work through one section at a time. Use the videos for explanation and the PlaySheet pieces for actual practice.
Use one backbone course. Play several short pieces at the current level, then test yourself with unfamiliar music. If reading falls apart, stay at that level a little longer.