This is the 3902nd most frequent Japanese word.
ギター
"Guitar."
In this sentence, 'ギター' functions as a direct object of the verb '弾く', indicating the musical instrument that is played.
彼はギターを弾くのがとても上手です。
He is very skilled at playing the guitar.
Here, 'ギター' appears as the object of the action '購入する', representing the item being purchased.
ギターを購入するために音楽店に行きました。
I went to the music store to buy a guitar.
In this example, 'ギター' is part of the construct 'ギターについて', indicating the topic ('about guitars') described in the book.