There is a wide range of material that you may provide to your students in the physical classroom without any permission required. You are encouraged to make use of Library-licensed resources, materials not protected by copyright, materials available under Creative Commons and open access licences, and your own unpublished materials. Alternatively, you can also rely on any applicable Exceptions to copyright.
If you are unsure as to what you are permitted to do, remember that providing your students with a link to a legitimate source, which directs them to the material in question, is always permitted! For more information on creating persistent links, see Linking to full-text articles and e-books.