Read thoroughly to understand why someone wrote/edited something the way they did. Check for patterns of prior behavior, ask direct questions, and double check your own concepts and avilable knowledge base before attempting to edit.
Just because you can, doesn't mean its right to unilaterally revert long edits. Instead, take time out to correct just the part you feel should be replaced. Don't negate someone's hardwork of genuinely trying to make a Wiki better.
Always be courteous, especially when writing the edit summary, and while pointing something out to other users on their talk pages, or justifying your actions.
Ever since we got an internet connection at home, back when I was in Class 8, I've been lost in Wikipedia. Since then, I've spent thousands of hours surfing through pages, often with no particular end in mind. But I frequently saw that articles were not accurate, or simply articulated enough. The day I realized that I only keep on taking from the community and never give anything back is the day I made my first edit.
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