With Reinforcement Learning (RL), machines learn optimal behavior by interacting with environments, receiving rewards or penalties, and improving over time. It is a key driver of modern AI success in for example robotics and games.
RL has progressed to a core area of modern AI. Early milestones (80s) include Q-learning. Later advances with deep nets have enabled real-world applications, making RL a powerful tool for sequential decision-making in complex environments.
There is little doubt that AI and RL are evolving fields set to revolutionize science and technology. The question you should ask yourself is: do you want to use a manual screwdriver while others have a far more efficient electric one?