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This is an interactive tutorial that walks you through how to use Wikipedia. It covers how to create an account, edit pages, message users, and navigate the site. It takes less than an hour to complete, and by the end you will be ready to contribute to Wikipedia.
This page in a nutshell: Do not edit Wikipedia to promote your own interests, or those of other individuals or of organizations, including employers. Do not write about these things unless you are certain that a neutral editor would agree that your edits improve Wikipedia.