The Bhagavad-Gita consists of 18 chapters. Each chapter is called a yoga. Yoga is the science of the individual consciousness attaining communion with the Ultimate Consciousness. So each chapter is a highly specialized yoga revealing the path of attaining realization of the Ultimate Truth. The first six chapters have been classified as the Karma Yoga section as they mainly deal with the science of the individual consciousness attaining communion with the Ultimate Consciousness through actions. These chapters are:

Chapter 1 : Visada Yoga
Chapter 2 : Sankhya Yoga
Chapter 3 : Karma Yoga
Chapter 4 : Jnana Yoga
Chapter 5 : Karma Vairagya Yoga
Chapter 6 : Abhyasa Yoga
The middle six chapters have been designated as the Bhakti Yoga section as they principally are pertaining with the science of the individual consciousness attaning communion with the Ultimate Consciousness by the path of devotion.

Chapter 7 : Paramahamsa Vijnana Yoga
Chapter 8 : Aksara-Parabrahman Yoga
Chapter 9 : Raja-Vidya-Guhya Yoga
Chapter 10 : Vibhuti-Vistara-Yoga
Chapter 11 : Visvarupa-Darsana Yoga
Chapter 12 : Bhakti Yoga
The final six chapters are regarded as the Jnana Yoga section as they are primarily concerned with the science of the individual consciousness attaining communion with the Ultimate Consciousness through the intellect.

Chapter 13 : Ksetra-Ksetrajna Vibhaga Yoga
Chapter 14 : Gunatraya-Vibhaga Yoga
Chapter 15 : Purusottama Yoga
Chapter 16 : Daivasura-Sampad-Vibhaga Yoga
Chapter 17 : Sraddhatraya-Vibhaga Yoga
Chapter 18 : Moksa-Opadesa Yoga