Wikipedia:Did you know... is a section you can see on the Main Page. Wikipedia:Did you know (WP:DYK) is the project page for the "Did you know" section.
The DYK section showcases new or expanded articles that are selected through an informal review process. It is not a general trivia section. For the discussion page see WT:DYK.
Beginners should consult this Did You Know glossary if they don't understand any of the terms used. Beginners may like to start by looking at a summary of our many rules: this provides links to pages with more detailed explanations (which in turn may link to even more detailed pages).