2. What Are Wikis, and Why Should You Use Them?
The term "wikiwiki" actually means quick in Hawaiian.
Wiki is a website that allows collaborative editing of its content and structure by its users.
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3. List of wikis There ara a lot of websites that use a wiki model.
These websites provide content management system for their users' needs.
they all share the same basic editing and viewing website model.
Examples:
Astro-Databank: publishes the huge collection of astrological data.
Computer history: "Older" hardware &/or software..
Here is a list of all wikis:

4. Wikipedia
Wikipedia was initially conceived as a feeder project for the Wales-founded Nupedia, an earlier project to produce a free online encyclopedia, volunteered by Bomis, a web- advertising firm owned by Jimmy Wales, Tim Shell and Michael E. Davis.
Wikipedia is a free, open content online encyclopedia created through the collaborative effort of a community of users known as Wikipedians. Anyone registered on the site can create an article for publication; registration is not required to edit articles.
Wikipedia is not a reliable source. Wikipedia can be edited by anyone at any time. This means that any information it contains at any particular time could be vandalism, a work in progress, or just plain wrong. ... Wikipedia generally uses reliable secondary sources, which vet data from primary sources.
Anyone with Internet access can write and make changes to Wikipedia articles, except in limited cases where editing is restricted to prevent disruption or vandalism. Users can contribute anonymously, under a pseudonym, or, if they choose to, with their real identity.

5. Wikipedia projects
In addition to the encyclopedia, the non-profit Wikipedia foundation oversees several other open-content projects, including:
Wiktionary, a dictionary and thesaurus
Wikibooks, a collection of free texts and other books
Wikiquote, a collection of quotations
Wikisource, a collection of free source documents
Wikiversity, a collection of free learning materials
Wikispecies, a directory of species
Meta-Wiki, which coordinates all the other projects

6. How can I create a Wikipedia account?
First, click here.
Fill the boxes.

7. Why create an account on Wikipedia?
Choose an appropriate user name.
Create your own user page, to collaborate, share information about yourself.
Communicate with other editors via your own talk page. You can also opt in to exchanging  s with other users.
View a convenient list of all your contributions (edits), and use your watch list to monitor changes made to pages that interest you.
Use your unified login to work on Wikimedia's other projects
Use more advanced editing tools
Vote for the Picture of the Year and members of the Wikimedia Board.
How to create pages:

8. Editing Wikipedia
anyone can edit any unprotected page and improve articles immediately for all readers.
You do not need to register to do this.
Anyone who has edited is known as a "Wikipedian" .
Wikipedia uses two methods of editing:
the new Visual Editor (VE),
classic editing through wiki markup (wikitext).

9. Protected pages Some pages are protected from editing.
These pages are denoted by a lock icon on the top right of the page.
it will have a "View source" tab instead of an "Edit" tab.
You can still edit these pages indirectly, by submitting an edit request—an editor with the ability to edit the protected page will respond to your request.
You can submit a request by clicking on the "View source" tab on that page and using the "Submit an edit request" link at the bottom right.

10. Editing