Exploring the New Article Creator/Editor (Backend)
Clicking the "New" button will take you to the article editor, which will allow you to easily create content. If you've ever worked with a blogging client like LiveJournal or any word processers like Word or Open Office, this will be very easy to operate.
The included WYSIWYG editor is very easy to use, including all your basic word processing functions, including text formatting, table creation, and text alignment. There are also options for adding page anchors, images, cleaning up messy code, and even editing HTML if need be.
The "Title" field is what will appear at the top of your article. This can be whatever you would like, such as "My 25 Favorite Songs" or "Best Reasons to Buy in Bulk." The "Alias" field easily allows you to name it something shorter, which is what will display in the URL bar. This is great for SEO-friendly URLs. Selecting the "Published" option will set the article to appear live on the site, or allow you to take an article down from the site if needed. The "Frontpage" does exactly what it says, sets an article to appear on the front page (or not) if you like.
Setting the section and category is relatively easy, and there is an article that explains what those are and how to set them here: Joomla: Section Vs. Category.
Saving your article is as simple as clicking the "Save" button at the top of the screen.