I am a beginner as well,
a hint on those single cords.
hold the g string A note and then just move the first finge between the b and g, then try not looking and lift off the a and switch your first finger to the b string and strum both. till can make that change.
then try going back and doing all 3 like in the lesson thats how I got it.
other useless info about what your next couple weeks will be like.
I play as much as I can till my hand hurts and I cant even open a soda can, switching to bottles only got me a extra half hour.
but here is what I have learned. It sucks I suck, then all sudden BREAKTHROUGH! guess that was easy.
This is my path sometimes I can practice all day and then let my hand heal then do it again. then all sudden it works. dont really know when I learned it but i did
I have almost finished guitar fundementals 1.
I do the lessons like the A d e cords then I try to strum each string through the cords without stopping through those 3 cords without a pause or mistake.
the B cord is eating me alive but hey i got a good solid f d g a df c d ect random roatation. I try strum once or twice or down down up down next cord.
then think the term is arpegiate through the cords.
over and over as I done that it all just seems to become easy.
for example learn the intro to simple man lynard skinner perfect practice for the C cord
Just keep in mind dont give up over and over then at that moment BAM! instance perfect every time Now to move on.
other thing is when it start going smoothly try to look away I am not good at looking away but seems when I can get my eyes off the guitar and play what I am trying it become second nature. now to just convince myself to go blind too it. thats the secret.
eyes wide open still tho.