What is intonation on a guitar, and is it important? Well, yes, it could be very. If your guitar is poorly intonated it could play horribly out of tune! It may sound fine down low playing open chords, but suddenly, when the solo starts, up at the fifteenth fret… aaaahhhhgg!
I’ve known young guitarists change out tuning keys, and even buy new guitars because their old guitar would never stay in tune. In many instances it was just a matter of a poor setup, with nothing wrong with the guitar or any of it’s components.
But don’t worry, adjusting intonation is really very easy. All you need is a guitar tuner and a screwdriver. This article tells you how.