This textbook provides knowledge of artificial intelligence (AI), wireless communications, and cellular networks. It covers AI techniques such as unsupervised learning, supervised learning, reinforcement learning, deep learning, and 6G technologies like massive MIMO, open RAN, and more. Readers of the book will gain insights into the relationships and synergies between these AI techniques and 6G ecosystems. Additionally, they will develop an understanding of how AI techniques can be instrumental in designing and optimizing 6G systems, and how 6G systems, in turn, can contribute to the creation of new AI applications and use cases. The textbook will be of interest to students studying artificial intelligence, wireless communications, mobile networks, and electrical engineering, as well as professionals in the field.