Recommended resourse to deepen your understanding of doctrine and theology
John Stott: The Cross of Christ (book)
Wayne Grudem: Bible Doctrine (book)
John Piper: The Story of His Glory (free 1-hour audio)
John Piper: TULIP: The Pursuit of God’s Glory in Salvation (free 9-part audio)
Sam Storms: Chosen for Life: The Case for Divine Election (book)