This is a general introduction for visitors to Wikipedia who wish to participate in this project. For a detailed account of the Wikipedia project itself, see Wikipedia:About. For information on searching and browsing the encyclopedia, see Help:Navigation.
Welcome aboard! We're glad you wish to help develop Wikipedia, and we hope you enjoy participating in this virtual community as much as we do. As a new contributor, you may feel a little overwhelmed by the sheer size and scope of this project (which includes over 100,000 regular participants)...
...but don't worry, things will become easier and clearer as you go, and if you have any problems, there will always be other Wikipedians happy to help, see Wikipedia:Requests for more information. There are some resources set forth below to help you get started. Good luck and have fun! -- The Wikipedia Welcoming Committee
Tip: Sign your name - At the end of your comments simply type four tildes (~), like this: ~~~~. If you are using the edit toolbar option (it usually appears above the edit screen by default), click the signature icon: or , to add the four tildes; this will automatically produce your username and the time, aiding the flow of discussion.
Finding your way around
To understand Wikipedia, it is easiest to think of this website as having two types of pages: pages that are part of the encyclopedia itself, and pages of the community (used by contributors to help build and operate the encyclopedia).
To find your way around the encyclopedia, either enter a term into the search box at the top-right side of the screen, or go to Wikipedia's table of contents. Clicking on links like this one will take you to relevant or related pages. If you know the name of the topic you are looking for, simply type it into Wikipedia's search box and press Go.
WikiProjects are social groups of contributors (anyone may join them), who work together as a team to improve Wikipedia. These groups often focus on a specific topic area (for example, women's history) or a specific kind of task (for example, copyediting). WikiProject are one of the central places for editor collaboration and the organization of specific topics. The English Wikipedia currently has over 2,000 WikiProjects and they all have a variety of tasks to get done (for example, Canadian articles to improve).
If you've made a mistake and wish to undo it, revert it. Here's how: click history at the top of the page you made the mistake on. Then click on undo at the end of the first line which is your edit. Then publish changes. See more detailed instructions at Help:Reverting.
There are two main styles of help on Wikipedia: self-help and assistance...
Self-help involves reading the help and instruction pages around Wikipedia. Some very informative self-help pages are: