Discussion pages (also called talk pages) are a key feature of Wikipedia, offering the ability to discuss articles and other issues with other Wikipedians.
If you have a question, concern or comment related to improving the article put a note in the article's talk page and not in the article itself. You do that by clicking the "discussion" tab at the top of the page. Do not worry if the link shows up in red; it is all right to create the talk page if it does not already exist.
For discussing issues related to the content of the article (e.g. to query a source or propose the addition or removal of a section)
They are not for discussing the subject of the article itself.
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Wikipedia talk pages
For discussing issues relating to the running of Wikipedia.
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User talk pages
For communicating directly with specific other editors (e.g. to ask for advice or direct their attention to an article)
They are not for social networking.
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You have your own user talk page on which other contributors can leave messages. This includes contributors who have not created an account. If someone has left you a message, you will see a note saying "You have new messages", with a link to your user talk page.
The simplest way of indenting is to place a colon (:) at the beginning of a line. The more colons you put, the further indented the text will be. A newline (pressing Enter or Return) marks the end of the indented paragraph.
You can also indent using bullets, usually used for lists. To insert a bullet, use an asterisk (*). Similar to indentation, more asterisks in front of a paragraph means more indentation.