guitar
The word 'guitare' is a noun in French which represents a commonly used musical instrument, just like in English. It is used in the same context where you speak about guitar in English. For instance, 'Je joue de la guitare' translates to 'I play the guitar'.
The guitar is a beautiful instrument
In French, adjectives usually follow the noun they modify, which is different to English where adjectives usually precede the noun.
I like to play guitar
In French, when referring to playing an instrument, 'jouer de' is used instead of the English 'play'.
Can you tune my guitar?
This sentence represents an interrogative structure in French. In French, you can turn a statement into a question by placing the verb before the subject pronoun, here 'Peux-tu' means 'Can you'.