I've read 90% of Sider's Logic for Philosophy and thought it was great - very lucid. Assuming I am more or less familiar with what's introduced there, are there any great resources out there for learning deontic logic? It doesn't have to be a textbook - a short paper or online lecture notes would be great too.
I highly recommend the Handbook of Deontic Logic and Normative Systems. It provides an introduction to standard formalisms, conceptual distinctions, outstanding problems, and putative solutions, written by a variety of deontic logic specialists. I'd consider it a natural next step after working through Sider's text.