What does fret every string on a guitar mean?

Fretting a guitar string means pressing the string down against the fretboard at a specific position to change its pitch. When you fret a string, you are essentially shortening its vibrating length, which increases its pitch. The higher up the neck you fret a string, the shorter the vibrating length and the higher the pitch.

Each fret on the guitar neck is positioned to create a specific semitone (half-step) interval between the fretted note and the open string. For example, the first fret on the E string creates an F note, which is one semitone higher than the open E string. The second fret creates an F# note, which is one semitone higher than the first fret, and so on.

Fretting every string on a guitar means playing all six strings at once while fretting each one at a specific position. This can be done by using a barre chord, where the index finger is used to fret all of the strings across the fretboard, or by using a combination of fingers to fret different strings at different frets.

Fretting every string on a guitar can create a full and lush sound, and it is often used in strumming patterns and power chords. It is also a common technique in fingerstyle guitar playing, where individual notes are picked and fretted to create melodies.