These books are about what happened to the people of Israel, from the time of King Solomon to the time both the northern and southern kingdoms were destroyed. They describe how Israel split into two kingdoms after Solomon died and about all the kings that ruled over each kingdom after Solomon died.
In the southern kingdom, some kings did what Yahweh judged to be right. For example, King Josiah repaired the temple and reformed the worship of Yahweh. He responded to the high priest finding a copy of the Law of Yahweh in Jerusalem 2 Kings 22–23. However, all of the kings of the northern kingdom were wicked.
The Books of 1 and 2 Kings were originally one book in Hebrew. They were separated into two books when translated into Greek. Translators might choose more meaningful titles such as "The First Book about the Kings" and "The Second Book about the Kings."
These books were probably finished during the exile, after the Babylonians had destroyed the temple. They show how being faithful to Yahweh results in his blessing and prospering his people. Worshipping idols and not being faithful result in their being punished and destroyed.