When transposing stuff from the piano you need ot be aware that the piano is the instrument with the biggest tonal range. The tonal range of a guitar is with a normal tuning on a 24 fret guitar from E to e''' (4 octaves) - a piano has about 8 octaves. SO you have to transpose some stuff upwards and some stuff downwards and of course you have to be aware of the physical aspect -you just cannot play certain stuff that can be played on the piano because you would need like 10 fingers and a huge hand.
so you also need some skills in mucis-theory to find chordal structures and transpose them to the guitar so that they can be played. you will also have to leave certain notes away - this is allowed as long as the characteristic of the piece remains the same.
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