Deep R Programming is a comprehensive and in-depth introductory course on one of the most popular languages for data science. It equips ambitious students, professionals, and researchers with the knowledge and skills to become independent users of this potent environment so that they can tackle any problem related to data wrangling and analytics, numerical computing, statistics, and machine learning. This early draft is distributed in the hope that it will be useful. This textbook is a non-profit project. Its online and PDF versions are freely available at https://deepr.gagolewski.com/. Dr habil. Marek Gagolewski is a Senior Lecturer in Applied AI/Data Science at Deakin University in Melbourne, Australia and an Associate Professor (on le...