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JST For Dummies

I am interested in learning how to use connectors, but am having trouble finding a beginner's guide. I looked at Molex, but think JST makes more sense for my small projects. Is there a resource that describes what parts are necessary and how to do it. I'm probably only interested in 2, 3 and 4 wire in-line connectors. Is DigiKey the primary source for JST parts? One of the things I want to avoid is buying things that I don't need (e.g., the wrong size crimper). So, as the subject line implies, I'm looking for an absolute beginners' guide to JST connectors.  Thanks.