Help for Better man by Jae Parks
 

So I got most of the song down.

Key of A
four chords

Dmaj7......x57655...D,F#,A,C#
C#min7....446444...C#,Eb,G#,B
Bmin7......224222...B,Db,F#,A
Amaj7......002120...A,C#,E,G#

Transitional chord is Dmin with open E string. 000231

The tutorial on this song is not very detailed.
I need help on the strumming though. Any explanation?
Please explain like I'm an idiot.
I'm new at guitar.