F Barre Chord
The first barre chord you should learn is the F barre chord. This is a good lesson on just the F barre chord – it shows how to place your fingers, how to roll your barring first finger if needed to reduce buzzing or pain, and covers positioning your hand and wrist: https://www.justinguitar.com/guitar-lessons/the-f-chord-b2-901
E and A Major and Minor Shape Barre Chords
This is a good lesson on barre chords after you’ve learned the F barre chord: https://www.justinguitar.com/guitar-lessons/easy-barre-chords-for-beginners-bg-2303
Power Chords
This is a good lesson on power chords (usually the 133 pattern of a barre chord) and you may want to learn this along with barre chords: https://www.justinguitar.com/guitar-lessons/power-chords-bg-1201
Group Guitar Lessons, 1B, Barre Chords