Best Free Resources to Learn Reinforcement Learning in 2023

Several days ago, AlphaTensor was introduced by DeepMind on Nature. I think this is the third time that DeepMind’s Reinforcement Learning(RL) research hits Nature(AlphaGO, AlphaFold and AlphaTensor now). Although RL is powerful, it is more difficult to jump in because there are fewer resources or systematical resources on this topic. I guess the situation is better now, but this is how I felt when