This video from the Bible Project does a nice job of providing an brief (8 minute) overview of the Book of Hebrews.
The video breaks Hebrews into five sections:
- Angels and the Torah (chapters 1-2)
- Moses and the Promised Land (chapters 3-4)
- Priests and Melchizedek (chapters 5-7)
- Sacrifice and Covenant (chapters 8-10)
- Follow Great Models of Faith (chapters 11-13)