Hundreds (!) of portals -- thematic gateways to wikipedia content on all kinds of topics -- in the following categories: Arts, Biography, Geography, History, Mathematics, Philosophy, Science, Society , and Technology.
Two lists of Wikipedias for various languages (actually the same list ordered in two ways). The first list, ordered by size, is the complete list of all 229. The second list is ordered by local language name.
This is where to ask questions on how to use Wikipedia such as how to work on articles, how to operate the software to use Wikipedia, and how to participate in Wikipedia
The Community Portal is the central place to find out what's happening on Wikipedia. Learn what tasks need to be done, what groups can be joined, and get or post news about recent events or current activities.