The neat thing about bar chords is that you can easily play all the Major and Minor chords once you learn how. Fret an E chord using your middle, ring and pinky fingers. Now move your hand up up one fret and fret across all six strings on the first fret with your index finger - now you've made an F Major chord. Move your hand up another fret to make an F# Major Chord. Every time you move your hand up a fret, you create a Barre chord 1/2 step higher than the last.
So - a D Major chord is a Barre chord at the 10th fret.
You can make any of these a Minor chord by basing your chord on an E Minor - use your ring and pinky finger and Barre with your index finger.
You can do the same with an A Major or Minor Chord. Chord an A Major using only your ring finger - fret the 2nd, 3rd and 4th strings. Now move up one fret and use your index finger to Barre all six strings. Now you've made a Bb Chord. For a minor chord, fret the 2nd, 3rd and 4th strings with your middle, ring and pinky, then Barre with your index finger.
Barre chords take practice to play cleanly, but they are a staple of guitar that you have to learn.