This is the 15th most frequent Greek word.
στα
"Στα" is a Greek preposition meaning "at," "in," or "to the" (contracted form of "σε + τα").
In this sentence, 'στα' is a contraction of the preposition 'σε' and the definite article 'τα', which together mean 'to the' or 'at the' in the context of a plural neuter noun.
Πήγα στα μαγαζιά.
I went to the stores.
Here, 'στα' is a contraction of 'σε' and 'τα', indicating 'on the' or 'in the' for a plural neuter noun, showing location.
Το βιβλίο είναι στα ράφια.
The book is on the shelves.
In this case, 'στα' means 'in the', highlighting the possession or location regarding a plural neuter noun.