Help:Editing

Very quick essential points
Firstly, the article headers are your friend. Use "=" to create these. Only one is a big title, 2 for smaller ones, 3 for smaller. Use == as the standard for a header. Secondly, the "*" is your friend. It creates a bullet. Use these liberally.

Organization is important. The overview of a topic should be at the top, and have the title "Overview". Also important is a TODO for your article. It's nice to know what is inaccurate about the article and/or what you still need to work on in a project. So put a TODO there to let us know.

Other than that, read Wikimedia's Help:Editing, or at least, glance over it. It's a quick cheatsheet of the wiki syntax and will really help when it comes to making good articles.