This is the 1486th most frequent Spanish word.
sabes
"Sabes" means "you know."
In this sentence, 'sabes' is used to ask if the listener is aware or has knowledge of the location of the library.
¿Sabes dónde está la biblioteca?
Do you know where the library is?
Here, 'sabes' expresses the ability or skill of the individual to play the guitar.
Sabes tocar la guitarra muy bien.
You know how to play the guitar very well.
In this context, 'sabes' refers to possessing the information or answer to the question at hand.