Becoming "fake news" competent requires more than a "one shot" lesson. Moreover, instruction -- 
and practice -- about fake news should be integrated into the curriculum rather than considered an optional "add-on." Fake news crosses the traditional academic domains; it involves language arts, social studies, math, science, arts, health and physical education. Fake news also serves as a "gateway" topic that can interest learners in the underlying literacies needed to identify and respond to fake news: news literacy, media literacy, visual literacy, digital (ICT) literacy, as well as information literacy. Ideally, a fake-news infused curriculum should be an organization-wide initiative that meets the needs of its stakeholders.
Here are general curricula about fake news and associated literacies.
Core elements of fake news curriculum include:
Here are some of the instructional issues and strategies involved in teaching about fake news.
Farmer, L. Media literacy education PPT
Agnostinelli, T. Boolean logic in information literacy instruction sessions.
Florida Association of College & Research Libraries. (2017). Fake news and digital library conference presentations
Here are several good videos on fake news; these and other videos are also found under specific headings.