The major 7th chord is easy to play and will substitute for a major chord quite nicely.
A Major 7th (Open)
A Shape Major 7th Barred
(audio example is DM7 with it’s root note on the 5st fret)
You can determine the name of the chord when the root (lowest) note is
played on the frets in the chart below.
Play the A shape Major 7th barre chord on the first 12 frets starting
on the 1st fret. Listen to this exercise in the audio example below. You
may want to say the names of the chords as you travel up and down the
fretboard to help you remember them.