This is the 2nd most frequent Hebrew word.
על
"On," "about," "over," or "regarding."
Expresses a physical position or location.
הספר נמצא על השולחן.
The book is on the table.
Denotes a focus or consideration regarding a topic.
אני חושב על הבעיה הרבה.
I think about the problem a lot.
Indicates the subject of discussion.