(The reason for the lateness of my reply is that I haven't checked LW in couple of months.)

I took a sequence of two introductory classes (titled "financial accounting" and "managerial accounting") at a third-rate college. That was very valuable. (They were very easy classes.) Just reading a textbook or two would probably suffice for you. I do not have any textbook titles to recommend, but it seems hard to screw up a textbook on introductory accounting, so I'd just pick the texts that are easiest for you to get your hands on. A 50-year-old textbook is probably OK, BTW; the material has not changed much.

After digesting a textbook or two, if you still want to learn more, or if you want to complement your general knowledge with much more specific knowledge from an expert practitioner of a field in which knowledge of accounting practices is required, I recommend Ian Grigg's blog.