A power chord is the guitar's cheat code: just the root and the perfect fifth above it, nothing else. No third means no major, no minor — the chord is harmonically neutral, which is exactly why it sits comfortably under almost any chord in a progression (Gitori's breakdown of why a "5 chord" is neither major nor minor and the power chord entry on Wikipedia both walk through the interval math). Roberto's full guide to applying power chords → covers the shape itself and three real songs to try it on. This post is the drill I actually give beginners, because knowing the shape and finding it instantly, anywhere on the neck, without looking, are two very different skills.
Day 1: root on the low E string
Metronome at 60 bpm, one power chord per click. Start on the open E5 shape, then crawl up one fret at a time — F5, F♯5, G5 — all the way to the 12th fret and back down. Keep your fretting-hand shape identical the whole way; only the position changes. Once that's clean, double the speed and cut the chord short with a quick palm mute between each hit so you're training the release, not just the attack.
Day 2: root on the A string
Same crawl, one string down. This is the shape most rhythm parts actually live on, and it's also where beginners get lazy and keep glancing at the fretboard. Cover the neck with your other hand or look away entirely — the goal is to feel the fret spacing, not read it.
Day 3: the string that breaks the pattern
Standard tuning isn't evenly spaced: every pair of adjacent strings is a perfect fourth apart except the G and B strings, which sit a major third apart instead (Fender's rundown of how EADGBE came to be explains the compromise). That one "kink" is why a power chord shape that adds an octave on the D string has to shift its top note down a fret the moment you build the same shape rooted on the G string. Play a power chord rooted on the D string with the octave added, then move the whole shape up to the G string and listen for the note that suddenly needs adjusting — that's the kink doing its job.
Day 4: prove the ambiguity to your own ears
Loop a simple chord progression twice — once treating it as major, once as minor, same root notes both times — and play nothing but power chords over both loops. Because the shape never states a third, it should sit under either version without a single wrong note. If it doesn't, the issue is timing or muting, never the chord choice — that's the whole point of leaving the third out.

For the shape itself and three real songs to apply it to, see the full power chords guide →; for the five things that quietly go wrong once you start playing them fast, 5 power chord mistakes beginners make → is the next stop.
If this routine got your power chords landing on the click instead of near it, you can throw a coffee my way on Patreon — no pressure, purely for the riffs. Now go crawl that fretboard.