Kashrut.com has resources for anything to do with kosher food, from articles to links and a wonderful program for zemanim anywhere in the world.
Can Do Kosher! A Quick and Concise Guide to Becoming Kosher by Chasya Katriela Eshkol, is a compact book filled with information. Bring it with you to tavel, or give it to someone who needs to learn the basics. Order from this link.
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