Bar chords are terrific for Acoustic or big box enhanced guitars, for most kinds of songs. They are tough to master at first, but when you realise that only one three finger Chord pattern on the 2nd fret- (behind your first prolonged finger on the first fret, repeated up the neck), offers you twelve chords from E to E – without altering your chord or fingering shape: E chord ends up being F that ends up being F sharp and so on:
E – F – F# – G – G # – A – A # – B – C – C# – D – D # – E
It unexpectedly opens an entire new variety of chords and sounds to you by using just the one guitar chord shape; the same for the minor or the seventh of the same chord in the above series.
Know your very first 3 chord shapes: E open chord and Em and E7 move that shape all the way up the neck, with your very first forefinger now functioning as a bridging bar- see any Chord directory site- and you get all the above related chords occurring. Twelve actions from E to E using the exact same chord shape!
The very same guideline gets the major or small or 7th positions in your lower case Triad of the A – Am – A7 chord positions. It is a matter of development up the neck: 12 actions from A to A:
A – A # – B – C – C# – D – D # – E – F – F# – G – G # – A.
Note that there is no sharp (#) or flat (b) in between E – F and B – C.
As you boil down the fret board the progression comes down as a (b) flat note. Check more info regarding blues chords in a quick read and video at the official website by Jim Bruce.
As you advance up the fret board the chord development goes up by a (#) sharp note.
Understand for that reason that F sharp and G flat are in the exact same position on the fret board, along with all the remainder of the sharps and flats in the above progressions. i.e. a sharp chord looks the like a flat chord, depending whether you are going up – or down – the Guitar fret board.
Have a good time!