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Hi @MarkI , welcome to TAC. I think you chose a great place to begin your guitar journey. You’re referring to the “Blues Shuffle” tab, which is set up in a standard 12 bar Blues fashion and using a 1-4-5 progression where A is the 1 chord, D is the 4 chord and E is the 5 chord. I doubt you’ll understand what I’m saying, but someday you will – so for now, just believe that the tab is correct. Yes, you start playing the open A string while fretting the D string on the 2nd then 4th frets and repeat, that is a partial A chord that you are playing. Then in the next measure you play a partial D chord where you play an open D string while fretting the 2nd then 4th frets of the G string. Then you play the partial E chord by playing the open loE string while fretting the 2nd then 4th frets of the A string.
Good luck Mark and have fun, don’t worry about the minutia at this point. Just know that you’re being taught by a great teacher in Tony.