A triad is three notes stacked in thirds. You can play it as a block, or as one note then the next, and it is still the same chord.
Major and minor are the two colours this instrument uses most. The root stays. The middle note moves. The fifth often stays put.
You do not need a theory exam to use this. You need one song page where a major chord and a minor chord sit side by side.
A major triad is a root, a major third, and a fifth. On the pad it has a settled, open feel. C, F and G on many folk pages are this colour.
A minor triad lowers that middle note. Am is the minor colour next to C in a lot of these charts. The letter A stays. The mood changes.
Open Ode to Joy. C, G and F are major triads. Am is minor. Play them as blocks and listen for which one leans.
C major lists the family around C. A minor lists the family around Am. They share letters. Home is the difference.
Amazing Grace is G, C and D. Three major triads. There is no minor name on that chart. The lean comes from the tune, not from a minor chord.
Simple Gifts adds Em to G, C and D. That one minor triad is the colour change. Find it in the table before you speed up.
ii–V–I Cadence is a ii–V–I written as triads. In C that is Dm, G and C. Two of those are minor and major in a short walk home.
Sevenths such as G7 add a fourth note. They are not triads. If a page prints G7, play the shape the diagram shows. Do not strip it down unless you mean to.
Use the Chord progression player and tap one chord at a time. Hold it until you can hum the root, then the third, then the fifth.
G major is a friendly place to start. G, C and D are the major pillars. Em is the relative minor, one step away in mood.
Auld Lang Syne puts G, D, Em and C in one tune. Name each chord major or minor before you play the bar. That takes ten seconds and saves a wrong colour.
When you transpose, the triad quality stays. A minor chord stays minor. Only the letter moves. The key chip on the page does that move for you.