Titles are important: they represent the question on the main site, in search results and in RSS feeds. We want users to visit questions (and to answer them) and a good title may make just the difference.
Also, titles fuel the search for related questions in the "Ask Question" form. A question titled "How to analyse this piece of code?" will never ...
We get pure mathematics questions regularly.
We are usually inclined to keep mathematics question if they are CS-ish in any way, so it's unlikely we'll migrate over something that would be offtopic.
We all know what a mathematics question looks like.
There is at least the potential danger of moving TCS questions there. I don't think ...
Programming questions are the largest group of offtopic questions.
Most of us can tell what a programming question is.
We'd probably migrate bad questions as well (which we should not do).
Most such questions need heavy retagging on SO, which ideally one of us would do.
Tagging is an important feature of Stack Exchange for several reasons.
Tags help searching.
Tags are used to select "Related" questions for the site bar.
Tags help disambiguate titles in question lists.
Tags allow users to filter what they see.
The last point is probably the most relevant: experts of an area may not even see a question just ...
Use the basic formatting provided by Markdown to structure posts: lists should be Markdown lists (nesting works!), links should use the [text](URL) syntax, emphasis should be placed by *...*, citations put in > ... paragraphs and source code in code blocks (prepend lines with four spaces). There is extensive documentation of what is ...
Rule of thumb: Provide references so that the work is uniquely identified and easily accessible for readers (in case of online resources).
References to books or papers should consist of more than a link or a book name. Not only do links break eventually, they also require a click; the reference should be clear as is. This ...
Anything along the lines of
"I'm only a beginner but I'm really, really hard-working" or
"Thanks in advance, cheers"
should be done away with immediately. While we can appreciate nice tone, questions and answers are not supposed to be (part of) a conversation.
Other elements that can be removed are
things like "EDIT:"
We keep a ...
Language often is a matter of taste and many of us are non-natives. Therefore, we are bound to find "strange" language more often than not, but that is no reason to edit everything.
On the other hand, posts need to be comprehensible. Sometimes, bad translations, inventive grammar and peculiar terms stand in the way of understanding a post.