The purpose of an article's talk page (accessible via the talk or discussion tab) is to provide space for editors to discuss changes to its associated article or project page. Article talk pages should not be used by editors as platforms for their personal views on a subject.
When talk pages in other namespaces and userspaces are used for discussion and communication between users, the same norms will usually apply.
Talk pages are generally created by clicking a red "Talk" tab and creating the page, like any other page.
Do not create an empty talk page simply so that one will exist for future use. Do not create a page solely to place the {{}}
template on it. and similar discussion warning templates should not be added to pages that do not have discussions on them. There is no need to add discussion warning templates to every talk page, or even to every talk page that contains a discussion.
It is not necessary to bring talk pages to publishing standards, so there is no need to correct typing/spelling errors, grammar, etc. It may irritate the users whose comments you are correcting. The basic rule—with some specific exceptions outlined below—is that you should not edit or delete the comments of other editors without their permission.
Never edit or move someone's comment to change its meaning, even on your own talk page.
Striking text constitutes a change in meaning, and should only be done by the user who wrote it or someone acting at their explicit request.
Cautiously editing or removing another editor's comments is sometimes allowed, but normally you should stop if there is any objection. If you make anything more than minor changes it is good practice to leave a short explanatory note such as "[possible libel removed by ~~~~]". Some examples of appropriately editing others' comments:
So long as no one has yet responded to your comment, it's accepted and common practice that you may continue to edit your remarks for a short while to correct mistakes, add links or otherwise improve them. If you've accidentally posted to the wrong page or section or if you've simply changed your mind, it's been only a short while and no one has yet responded, you may remove your comment entirely.
But if anyone has already replied to or quoted your original comment, changing your comment may deprive any replies of their original context, and this should be avoided. Once others have replied, or even if no one's replied but it's been more than a short while, if you wish to change or delete your comment, it is commonly best practice to indicate your changes.