Reinforcement Learning Explained

A Practical Problem-Solving Approach

By: Jonas Hellgren, Johannes Lindgren

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eText | 29 June 2026 | Edition Number 1

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Reinforcement Learning (RL) is a branch of Artificial Intelligence (AI) where agents learn optimal behavior through interaction with an environment by receiving feedback in the form of reward. After decades of research, RL has matured into a powerful technology driving real-world innovation; it is now used in areas such as robotics, energy systems, finance, and autonomous vehicles.

Yet, for many, RL feels inaccessible, buried under dense mathematics and complex theory. This book changes that. It is designed to help newcomers start applying RL as quickly as possible through a classical pedagogical approach: many small, focused examples that build intuition and practical skill step by step.

Featuring:

Essential concepts explained from the ground up
Code-based examples that reveal how algorithms work in practice
Worked examples by hand to strengthen intuition, just like in engineering or mathematics textbooks
Language-agnostic guidance, easily followed using Python, Java, or C++

Even readers without coding or university-level mathematics backgrounds will gain valuable insight into the fascinating world of RL—insight that may become a critical differentiator in the age of AI. Additional information, sample chapters, and short, easy-to-follow explanatory videos can be found on the author companion website here: relexp.com. Whether you are a student or professional, Reinforcement Learning Explained will give you the tools and confidence to explore one of AI's most exciting frontiers.