About the Book of Nahum
Nahum is telling the people in Nineveh (the capital of Assyria) that God will punish them. They are enemies of Israel and Judah. And they have hurt God's people and people from other countries too. Now God is going to punish them for all the wrong things that they have done. Until now, he has been very patient. We can read about that in the book of Jonah. But now he is very angry with the people in Nineveh.