Texas boogie rhythm is a low, greasy groove built on the open E string. The left hand adds little hammer-ons and chord stabs while the right hand keeps a steady shuffle.
Key: E. Everything lives in the first few frets of the low E and A strings.
The signature move is the hammer from G to G# (fret 3 to 4 on the low E string): minor third sliding into major third, which is pure blues. Pick fret 3 with your middle finger and hammer fret 4 with your ring finger. Your index stays on fret 2 for the B on the A string, and your ring finger also takes the C# at fret 4: the 5th and 6th, the classic boogie notes. The E5 stab is the open low E plus the 2nd fret on the A and D strings; follow it with a muted scratch by relaxing the fretting hand so the strings go dead.
Swing every pair of eighths: long-short, long-short. Keep the palm lightly on the low strings near the bridge so open notes thud instead of ring.
Tone
Bridge humbucker, moderate gain rather than full distortion, and a thick pick. Light strings and low action make the hammer-ons and bends easier. Pick hard for the stabs and lighter for the bass notes.
The most common mistake is rushing the hammer-on so it eats the next beat. The hammer takes its own step; let it breathe.
Practice the one-bar boogie until it grooves, then add the stab bar.