I mostly fix typos and add some information to articles. I also archive old talk page discussions with Archiver. I usually keep a few discussions in the talk page regardless of age now.
Wikipedia strives to be neutral (NPOV). Remember, you have a point of view (POV). Think about whether your edits will breach this. If you think other users will think it is POV (Wikijargon for "biased"), then run it past other editors using the talk page for the article. This will allow for constructive debate and editing rather than an edit war.
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