I'll describe my journey as I learn reinforcement learning from various resources online from scratch.
1. Reinforcement Learning Course by Thomas Simonini
Contains a detailed blog post for each topic, explained really well. Also contains support Youtube tutorials for each topic. Also contains a self explanatory IPython notebook along with each small topic. Uses OPENAI gym environments.
Great collection of resources related to RL containing everything from blogs, to videos, papers and implementation. skymind AI wiki