This is the 191st most frequent Hebrew word.
יודע
"Knows" (masculine singular).
This usage of "יודע" indicates a skill or proficiency in swimming acquired by the subject.
הוא יודע לשחות מגיל צעיר.
He knows how to swim from a young age.
Here, "יודעת" expresses familiarity or awareness of information, in this case the answer.
אני יודעת מה התשובה לשאלה.
I know the answer to the question.
In this sentence, "יודעים" conveys understanding or awareness about a locational fact.