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please check your warning again, and the links I provided in the warning. if you have any further questions, please ask below.
How do I cite sources?
please check out Reliable sources and Referencing for beginners. especially the former. I know it's not a short read, but reliable sources form the building block of everything you write in wikipedia articles.
Can you make me an article for X?
I don't make articles, sorry! however you can! just check out the guidelines at Your first article, and also go over through the Notability and Reliable sources guidelines (both are essential!) and the Simplified Manual of Style. if you want, I can help with your draft through copyreading and making it comply with these policies, however you'll still have to add sources and stuff. also note that making an article is very hard (but not impossible) for newcomers given the difficulty in determining which sources you can use as well as the truckload of reading material, so you might want to start with easier tasks first.
So if not make a new article, what easy stuff can I do as a beginner?
great question! I'd suggest checking out the Task center and your Homepage tab for this. in particular, copyediting is easy as long as you've got a good grasp of English grammar (and know the difference between British and American English and know not to change them when not necessary).
You haven't responded in a while. Where may I get an answer?
if I've been inactive in a while, please check out the Teahouse. it's a great place to ask questions, and once in a while I may pop in as well to help there.
...can you just keep my stuff unreverted? I just wanna have some fun.
sorry, I can't! millions of people use Wikipedia as a serious research tool so we have to keep our stuff clean and avoid misleading our audience. however instead of saving your changes, you could make a mock edit by placing your changes, but pressing Show preview instead of Publish changes and then taking a snip of the preview to show to your friends!
But [x] is the greatest/the worst!
great/bad for them! unfortunately, Wikipedia has to remain neutral at all times, which includes not saying that something is the best/the worst/other opinions unless said opinions are made by lots of sources and outlets, and even then it would be X is regarded by many as great/bad/etc and not X is great/bad/etc.
I am/know the person the article is about. Why are my stuff removed?
you may have a conflict of interest with the article, which could make it difficult for you to edit neutrally. you can still edit, however unless it's for minor stuff like typo fixes, it's better for you to discuss stuff at the relevant article's talk page first.
Why are you reverting the truth/reinstating false information?
Verifiability, not truth. truth itself is messy and relative, so what is true to one may not be true to another, so defining a singular truth to add is impossible. additionally, having sources allows anyone to see for themselves whether what we claim in an article is true or not. that goes the same way for false information: unless sources say that the claim/s made are false, it would be disruptive to remove them without getting consensus from the talk page first.
What pronouns do you use?
I use any! I don't mind you using he, she, or they. thanks for asking!
How'd you make your fancy signature?
a bit of CSS trickery! you can use Treat the above as wikimarkup and some <span> to apply CSS to your sig, which allows you to do stuff like signatures with backgrounds (color), round signatures (border-radius), and whatever'll fit in the 255-char limit.