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1. Don’t worry about any of the shapes except for the six string E major in the five string a major. All of the other shapes are fairly impossible or useless unless you’re a super advanced player.
2. Are you asking how many strings to play or how close to the headstock?
3 The lowest note in pitch or another words the note with the most bass. This is whatever note is played on the thickest string
4. You should memorize the notes on the low E and a string as most cords are routed on these two strings. I would only worry about memorizing up to about the seventh fret