In no particular order, here are some of my go-to resources for helping students and teachers understand the importance and the key concepts of copyright as it relates to school projects.

Stanford University Libraries
Stanford University Libraries offers the most comprehensive collection of resources about copyright and fair use that I know of. You could spend hours looking through all of the resources offered on the site. A few pages that teachers will find particularly useful are Charts and Tools, Academic and Educational Permissions, and Copyright FAQs.

Library of Congress – Copyright and Primary Sources
This page published by the Library of Congress addresses frequently asked questions related to the use of primary sources found the LOC’s sites and other places around the web. Classroom examples are included in the explanations found on the page.

Copyright & Creativity for Ethical Digital Citizens
Copyright & Creativity for Ethical Digital Citizens, hosted by the Internet Education Foundation, offers lesson plans and videos for teaching copyright in elementary school, middle school, and high school settings. Slides, lesson plans (as PDFs), and videos are available to use for free in your classroom. A sample video from the elementary school series of lessons is embedded below.

Copyright and Creative Commons Explained by Common Craft
This short video explains the big concepts of copyright and Creative Commons through the story of a photographer publishing a picture and a magazine editor who wants to use that picture for an article.

Copyright, Exceptions, and Fair Use: Crash Course Intellectual Property #3
This video is the third installment in Crash Course’s series on intellectual property. In typical Crash Course style, the video is a fast-paced overview of exceptions to Copyright and examples of Fair Use in action. The video is appropriate for high school students. Students younger than high school age may not understand a lot of the nuances used in the video.