Beyond that, you'll find textbooks on the topic as well. Courses on ERP (and related topics like MRP) are usually found in degree programs with names like "Management Information Systems" or something, not "Computer Science".
If you wanted to get your hands dirty, there are some open source ERP systems out there. One well known one is OFBiz, which is now an Apache project:
I'm not 100% sure I'd actually recommend anybody deploy OFBiz for a real business, but if you wanted to play around and get a feel for some of the concepts, it could be a useful starting point.
Finally, if you want to drink from a firehose, you could do something like this:
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