Welcome to week 18 of the Technique weekly challenge!
A one finger chord may sound easy and it's certainly worth learning at the beginner level, but it becomes most useful in an intermediate setting for linking rhythm and lead, transitioning from open to barre chords and more!
A Chord Variation

The open A major chord can be played in a multitude of ways!
1 Finger A Chord

The 1 finger A chord ‘pinches’ the neck between the 1st finger & base of the thumb
Pressure on the flat part of the 1st finger’s final knuckle allows the high E string to ring out along with the barred notes
Why Use It?
1 finger chords are a classic rock genre staple, featured in many riffs
Using just the 1st finger for an open chord instantly sets us up for bridging rhythm & lead playing with more appropriate technique & by freeing up the fingers too
With the 1st finger already barring, we can transition to other barre chords easier
