An article is a webpage.  Articles are organized into categories and sections.   A section is the top organizational level in Joomla.  It holds categories and articles.  Categories divide sections into smaller groups. For example, this article is in the section Tutorials Database, which holds all tutorials in all categories.  This article is also in the category Joomla.  So if you only wanted to see Joomla tutorials you would navigate to the Joomla category in the Tutorials Database section.

 To add an article in Joomla:

 

If you are on the Welcome page (the page you are sent to after logging in), you can click the large "Add  New Article" button:

If you are already in the Article Manager, click the "New" button:

 

3) A new article will open and you can begin entering text, images, or code. Be sure to select a Section and Category for your article to be saved in.

 

4) When you are done, click the "Save" button.  This will complete the article adding process by saving your content and it will exit the article editor. 

If you would like to save without exiting the article, you can click "Apply."  Then click "Save" when you are ready to exit the article editor.