dolmetsch.com
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Dolmetsch.com is a long-standing reference for music notation and early music, offering tutorials and articles on historical notation systems, musical terminology, instruments, and performance practice, plus scanned sources and other study resources.
More resources on Music Notation
Tonal Energy Tuner
The best tuner/metronome combination for musicians — ~£3 one-time purchase. Used by professionals and students alike for intonation training and rhythmic accuracy.
SightReadingFactory
Generates unlimited sight-reading exercises at adjustable difficulty — key, time signature, note range, hands separate or together. The most practical digital tool for daily sight-reading practice.
Improve Your Sight-Reading! Piano, Grade 1 by Paul Harris
The standard graded sight-reading series (Initial through Grade 8, matching ABRSM levels). Sight-reading is more trainable than most learners believe, and this series is the most systematic approach.
openmusictheory.com
Free textbook with notation section
teoria.com
Exercises for notation reading/writing
musictheory.net
Free interactive notation lessons