Paul's letter to the Ephesians praises spiritual blessings in Christ, urging believers to reflect these in their lives amid Ephesus' pagan culture and wealth.
Introduction to Ephesians
The Bible Project: Ephesians: A Complete Animated Overview
The Bible Project does a fantastic job at providing a clear and visual overview of each book in the Bible! Here is the video they have created to help you grasp the big picture of the book of Ephesians.