Here is a video that's a good refresher about the book of Daniel.
I found this summary of the video:
Prophetic Vision and Structure
The book of Daniel's two-part structure and language shift emphasize the significance of Chapters 2 and 7 as keys to understanding the book's later prophecies.
Daniel's vision in Chapter 2 depicts a statue of four metals symbolizing a sequence of human kingdoms, culminating in God's kingdom overthrowing earthly powers.
Divine Kingdom and Human Empires
Chapter 7 presents four beasts representing arrogant kingdoms, with the final beast embodying an evil empire led by a king who exalts himself above God and persecutes His people.
The book offers a pattern and promise that human kingdoms become violent when they glorify their own power, but God will ultimately confront them and establish His rule over all nations.
Faith and Patience
Daniel's visions encourage patience among God's people, urging them to wait for His kingdom while remaining faithful despite persecution and exile.