This is the 8th most frequent Hebrew word.
אם
"אם" in Hebrew means "if" or "mother," depending on context.
Here, 'אם' means 'if' and is used to introduce a conditional clause.
אם תלך לבית הספר, תלמד דברים חשובים.
If you go to school, you will learn important things.
In this sentence, 'אם' means 'whether' and is used to introduce indirect speech, indicating uncertainty.
שאלתי את אמא שלי אם היא ראתה את המפתחות שלי.
I asked my mother if she saw my keys.
Again, 'אם' has the meaning of 'whether', showing a situation of doubt or alternatives.