Despite the book being named after Ezra, we aren't introduced to him until chapter 7.

During the reconstruction of the Temple, the Israelites face adversity but they don't give up. Eventually Darius I reinstitute the command to rebuild the Temple.

The Israelites start rebuilding the Temple, are blocked by enemies but resume the task.

The most important event in Israel, is the building of the temple. Chronicles focuses on this heavily, with most of 1 Chronicles discussing David's preparation and the first 7 chapters of 2 Chronicles discussing Solomon actually building the temple.

The last few chapters of 1 Chronicles summarize David's legacy. Although the chapters are centered on David's rule as king, it is obvious that the main focus is on pricelessness of God.

Not only did David gather materials for building the Temple, he began preparing the Levites for the shift that they would experience regarding worship.

David does what he can to insure his son is well prepared to take up the mantle and build the Temple. This is a lesson for parents everywhere.

But the word of the Lord came to me, saying, Thou hast shed blood abundantly, and hast made great wars: thou shalt not build an house unto my name, because thou hast shed much blood upon the earth in my sight. 1 Chronicles 22:8 KJV God tells David he isn't to build the Ark, but we don't find out why until a few chapters later.