The book of Hebrews is a profound book with a life-changing message. The superiority of Christ is the message of the book. These should help you understand that message.
Dr. James White:
Dr. Michael Kruger:
RTS Charlotte: Hebrews Bible Study
Introduction to the Catholic Epistles and Authorship of Hebrews
Revelation: Background and Genre
Hebrews: Background and Structure
Hebrews: Typology and Covenant Themes
Hebrews: Priesthood of Christ and the Issue of Apostasy
Hebrews: Jesus as Superior Revelation
Hebrews: Israel and Sabbath Rest
Hebrews: The Priesthood of Melchizedek
D. A. Carson:
The Council 