This video talks about using wikipedia for research at the college/university level. But the same rules mostly apply to High School. If you want to use wikipedia as a source for your assignments, talk to your teacher first and make sure it's acceptable!
This guide is based on one created by Buffy Hamilton for The Unquiet Library, Creekview High School
This video gives you a great summary about what Wikipedia is and how it's different from other sources you might find in the library. What is a wiki? Who creates the info and how? What are its strengths and weaknesses as a research tool? These are all things you should know before you use it!