- Music: Lennon was a prolific songwriter and musician and is best known as a member of The Beatles. He also had a successful solo career and collaborated with other artists, such as Yoko Ono.
- Peace activism: Lennon was a vocal opponent of the Vietnam War and was involved in various anti-war and peace movements. He and Yoko Ono held several protests and demonstrations, including the famous "bed-in" protests.
- Art and literature: Lennon was an avid reader and enjoyed writing poetry. He also dabbled in painting and illustration.
- Spiritual and philosophical interests: Lennon was interested in Eastern philosophy and spirituality, particularly Zen Buddhism and the teachings of the Maharishi Mahesh Yogi. He also explored various new age ideas and practices.