-
Welcome to TAC. It’s been a while since I looked at this lesson and I don’t quite understand your question, but I’ll give it a shot. A chord is comprised of three notes. (But your ear can hear 3 notes even if you just play 2 notes since it is if familiar with the pattern). You will be strumming 2 notes on two strings. The first A section is the A and D strings. The second section is the D section so you are strumming the D and G Strings and the third section is the E section so you would strum the E and A strings. I think this addresses your question.
You don’t need to know this at this point to have fun, but for grins…This lessons is playing the shuffle in the key of A. I like math so A is the root or 1 chord. The blues shuffle is a 1-4-5 progression. So counting up… if 1 is A, then 4 is D and 5 is E. So you have your 3 sections.
Please be patient with yourself. It will all fall into place in time. Don’t let comparative thinking (even comparing your current self with your ideal self) frustrate you. And again, Welcome.