Here are the key main points covered in the Book of Revelation:

1. The revelation of Jesus Christ. The opening verse says this book is the "Revelation of Jesus Christ" - it unveils His glory, sovereignty, power, divinity, and role in final judgement and restoration.

2. Messages to the seven churches. Jesus addresses issues and commendations for 7 churches in Asia Minor, illustrating strengths and weaknesses common in all churches through the centuries.

3. God's judgement poured out. Much symbolic prophecy describes God's judgement, tribulation and wrath poured out on wickedness leading up to Christ's return.

4. The second coming of Christ. Jesus returns as conquering King of kings to defeat evil, deliver His people, and establish His millennial kingdom on earth. 

5. Satan defeated and judged. Satan's rebellion ends in defeat, he is bound, and ultimately thrown into the lake of fire forever. 

6. Resurrection and final judgement. The dead are judged before God's great white throne and either enter eternal life or eternal punishment.

7. New heavens and new earth. God restores and redeems His creation - there are new heavens, new earth and New Jerusalem where God dwells with His people forever. 

8. God reigns supreme. God is sovereign over history, salvation, judgement and restoration. Jesus Christ is central as Lord of lords and the Lamb who reigns, was slain, and is worshiped forever.

The overall emphasis is on the glory, sovereignty and victory of Jesus Christ over all opposition, and the hopeful eternal state enjoyed by those who put their trust in Him.