Editing Wikipedia

Basic editing

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Be bold!
Introductory tutorial
Contributing to Wikipedia
How to edit a page
Experiment in the sandbox
Show preview to review your edits before you save
Editing sections
Creating links
Making categories

Saving your edits

"Show preview"   —   always use this to avoid errors
Edit summary   —   please explain your edits
Minor edits   —   check this for typos and small corrections
Edit conflict   —   what to do when another editor changes the page while you're editing it

How to write an article

Starting an article
Article Wizard
Name a page
Naming conventions in general
Full list of specific naming conventions
Your first article
Article development (advanced editing)
Layout
The perfect article
Writing better articles
Editing shortcuts
Contributing to articles outside your native language
Editing with a text editor
Special page types
Disambiguation pages
Creating subpages

Style and formatting

Wikipedia's Manual of Style
Article size
Categorization
Citing sources
Article components
Lists
Tables
Redirects
Infoboxes
Using templates
Creating templates
List of templates
Modules, an advanced form of templates
Pictures and videos
Mathematical formulas
Hatnotes
Footnotes and references
Wiki markup
Cheatsheet
"Magic words"
Variables
Valid HTML codes in wikitext
Easy timeline syntax

Article standards

Biographies of living persons
Citing sources
Copyrights
Editing
External links
Image use
Using redirects
Include only verifiable information
Deletion
Manual of Style
Neutral point of view
What Wikipedia is not

Article maintenance

Use talk pages (discussion pages)
Archive a talk page
Tagging pages for problems
Merge two or more pages
Move or rename a page
Requested moves
Delete pages/images/categories
Stub articles
List of stub types
Revert a page to an earlier version
Dealing with vandalism
Protect and unprotect pages (Administrators only)
Link together Wikipedia articles in different languages
Link words in articles to Wikimedia sister projects
Use page names
Use namespaces
Use headings as anchors to link to
Do a purge
Test edits and other things

See also

Tips on editing
Simplified ruleset — Essential information to understand when editing articles (for new editors)
Category:Wikipedia information pages and Category:Wikipedia how-to