Wikipedia maintains a massive style guide governing all articles on the website. They call it the Manual of Style. It covers everything from preferred spellings to handling dates and numbers to proper deployment honorific titles.
Now, the purpose of this message is not to explain these rules—all in good time!—but to let you know it's there to be followed. But I'll still let you in on a secret—follow this one weird trick, and you won't look like such a n00b: use sentence case in page titles and article subject headings.
For example, there is a for Wikipedia entry "List of most expensive paintings"—not "List of Most Expensive Paintings". Save uppercase letters for the start of proper nouns—and if you see it the wrong way, you can fix it!