Is there any (probably online in these days) course you can recommend to learn more about Bayesian inference and RStan? I have some basic understanding of coding simple models in Stan (e.g., linear regressions) and want to learn more about it. A good course may well cost something.
Bayesian Inference is a general framework. you need to understand the theory and principles before you can put them into practice. the Stan case studies provide an excellent introduction - my fave is Bob Carpenter’s Hierarchical Partial Pooling for Repeated Binary Trials - perhaps I’m biased -
there are domain-specific examples of Stan models - again, in order to use them, you should understand the what these models do and follow the Bayesian workflow of model checking and model comparison.