The sus4 arpeggio replaces the 3rd with the 4th, building tension that begs to resolve back to the 3rd.
The sus4 arpeggio replaces the 3rd with the 4th, building tension that begs to resolve back to the 3rd. On guitar, the c sus4 arpeggio uses the notes C, F, G — the diagram above shows every one of them across all positions of the neck, with the root (C) highlighted so you can anchor each shape.
KnowYourNeck turns this into an interactive neck you can rotate through every position, switch between note names and scale degrees, and drill one box at a time with Focus Mode. It's the fastest way to actually learn the sus4 arpeggio instead of just reading a chart.