As you might expect for a site so named, Trackpedia offers a compendium of nearly 1000 racetracks around the world filled with maps, turn-by-turn guides and explanatory videos to provide an idea of what to expect should you go there to race. For each track there is also information about local lodgings as well as a GPS track map and listings of typical lap times, among other things.
Their directory includes tracks in Canada, the USA, Mexico, Argentina, Brazil, China, Japan, Europe, the Middle East, Australia and New Zealand among others, with each presenting detailed information as noted above.
Beyond that is a helpful guide to the various services available, including driver training courses, tips for vehicle maintenance and tuning, suggested reading material and a list of clubs and forums. So go have a look and see how much more of the available information may be relevant to your individual situation.