The staff is five lines whose positions encode pitch. In treble clef the lines are E-G-B-D-F and the spaces spell FACE.
Reading is pattern recognition, learned with repetitions, not memorized rules. Anchor a few landmark notes (middle C below the staff, G on the second line, C in the third space) and read neighbors relative to them.
Key signatures move the same seven letters up or down a semitone for the whole piece. The order of sharps and flats never changes, so a signature is a single glance, not seven separate accidentals.
Reading connects to hearing: on Tavi La Si every reading drill sounds its notes, so the symbol and the sound bind together from the first repetition.
Common questions
What are the notes on the treble staff?
Lines from bottom: E, G, B, D, F. Spaces from bottom: F, A, C, E.
What is the fastest way to learn to read music?
Landmark notes plus daily repetitions with sound. Read relative to a few anchors instead of counting every line, and let an exercise confirm each answer immediately.