See the Tech Library's Course Reserves page, which includes a video about copyright on campus. There is also a link to the Library's Policy Statement, an essential tool for teaching faculty wanting to post material online. Please note that when making a request for digitized material (scanned copies or links to online databases), use the Library's online request form.
The Center for Social Media (at American University) has videos and FAQs about fair use. These are listed below.
According to UNC-Charlotte's TEACH Act Toolkit, "If you wish to use 3rd party copyrighted materials in your online class, there are three options: meeting the requirements of §110(2) (aka TEACH Act), fair use, or asking permission."