When I learned photography years ago, I found some resources online and books that taught product photography. But I felt most of them only covering the tips of the iceberg, and I've tried to learn lighting mostly by observing retail lighting techniques. Especially on high end designer boutiques, they always find a way to make their product look very good. You can observe them and learn a thing or two. Of course you can't copy the lighting directly since they use a different retail shop type halogen lighting, where most photographers use strobes. But the principle is the same, and that's what you need to understand.

I do think that the website Strobist also teaches the principle of lighting pretty well. It'll be good to read their articles too. Just remember, don't copy the technique, but try to understand the underlying principle that makes a technique works.