This is the 158th most frequent Vietnamese word.
hết
"Finished," "over," "out of," or "no more."
Here, "hết" is used to indicate the completion of an action, implying that I have consumed all the food.
Tôi đã ăn hết phần cơm của mình.
I have finished eating my portion of rice.
In this context, "hết" signifies depletion or that there is no more water left in the bottle.
Nước trong chai đã hết.
The water in the bottle has run out.
In this sentence, "hết" is used to emphasize completeness, instructing to study fully every part of the book's content.