Pretty much anything you want to learn can be found online, but how do you know for sure if the article that you have located is written by a qualified professional? If you are looking for the best how to guides online, try wikiHow, the site that is "owned by everyone".
Wikivoyage is a wiki hosted by the Wikimedia foundation (the same organization that hosts Wikipedia). It offers 25,000+ travel guides to virtually every destination around the world. With it, you can expect to find out information that only locals would know about your next travel destination.