Any number of sub-topics are available: news literacy, health literacy, combatting misinformation/disinformation, role of confirmation bias, etc. Have a look at the Dimensions Database - https://app.dimensions.ai/discover/publication?search_mode=content&search_text=%22media%20literacy%22&search_type=kws&search_field=full_search&or_facet_open_access_status=oa_all (all articles are open access).
Also, have a look at the British Media and Information Literacy Alliance website - https://mila.org.uk/
Article Theory of Media Literacy : a Cognitive Approach / W.J. Potter.
In this paper, the theoretical underpinnings from communication theory and education were described. Even though a wide variety of theories have influenced media literacy education, it appears that media literacy scholar and practitioners are reaching consensus on which theoretical approach is the most appropriate. Overall, media literacy scholars have described a shift from a protectionist approach to media literacy to a more democratic approach influenced by educational scholars such as Freire (2000), Postman and Weingartner (1969), and Vygotsky (1962, 1978). They also reflect principles of more recent communication theories. This approach is more student-centered and emphasizes non-hierarchical teaching modes, reflection, and critical thinking. In recent communication and constructivist theories it is proposed that meaning is actively constructed by learners. In addition, media literacy scholars and organizations have established key concepts of media literacy which appear especially grounded in a constructivist and cultural studies framework. These conceptual understandings can provide a theoretical basis for the field of media literacy.