Wikipedia is not Yahoo! Answers. But if you have a general question such as, "Why is the sky blue?", and you cannot find a Wikipedia article that answers it, you can ask your question at the Wikipedia:Reference desk. If it turns out that no article on the subject exists, you can request one be written at Wikipedia:Requested articles.

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Creating a Wikipedia account has many benefits! For example, users with accounts have the ability to start new pages, edit semi-protected pages, rename pages, and upload images. Other benefits include having your own user page, a personal watchlist, the ability to implement a plethora of gadgets, and the potential to become an administrator!

To create an account, all you have to do is click on the "Sign in / create account" link, click on "Create one", enter a username, a password (twice), then click the "Create account" button. Consider attaching an email address to your account for user account password recovery, to receive system updates, or to receive email from other users. Nobody will see your email address until you choose to send them an email or reply to theirs.