As a starter I recommend reading one of these two books and one of these three essays -
Peter Singer & A. Friedman, Cybersecurity and Cyberwar (NY: Oxford UP, 2014).
Damien Van Puyvelde & Aaron Brantly, Cybersecurity: Politics, Governance and Conflict in Cyberspace (Cam: Polity 2019).
Myriam Dunn Cavelty, 'Cyber-Security', Chapter 27 in Alan Collins (ed) Contemporary Security Studies (Ox: Oxford UP, 2018).
Lewis Herrington, 'The New Frontier: Cyberespionage and Cyberwar' Chapter 32 in C. Andrew et al (eds) Secret Intelligence: A Reader (L: Routledge, 2019 2nd edition), pp.566-83.
Rhea Siers, ‘Cybersecurity’ in P.D. Williams and M. MacDonald (eds.) Security Studies: An introduction (L: Routledge, 2019 - 3rd edition), pp.556-69.
Other possible introductory reading includes >>
Jamie Barlett, The People Vs Tech: How the internet is killing democracy (and how we save it) (L: Penguin 2018)
Joel Brenner, America the vulnerable: inside the new threat matrix of digital espionage, crime, and warfare (NY: Penguin, 2011)
James Bridle, New Dark Age: Technology, Knowledge and the End of the Future (L: Verso Press, 2018).
Ben Buchanan, The Cybersecurity Dilemma: Hacking, Trust and Fear Between Nations (NY: Oxford UP, 2017)
Richard A. Clarke, Robert Knake, Cyber war: the next threat to national security and what to do about it
G Dyson, Turing’s Cathedral. The origins of the digital universe (NY: Vintage Books 2012)
G Conti & D. Raymond, On Cyber: Towards an Operational Art for Cyber Conflict (Kopidion, 2017)
Ron Deibert, Black Code (NY: Random House, 2013)
Patel, Raj, and Jason W. Moore. A history of the world in seven cheap things: A guide to capitalism, nature, and the future of the planet. (Berkeley: Univ of California Press, 2017).
David Sanger, The Perfect Weapon (L: Scribe, 2018)
A Segal, The Hacked World Order: How Nations Fight, Trade, Maneuver, and Manipulate in the Digital Age (NY: PublicAffairs, 2016)
Peter Singer & A. Friedman, Cybersecurity and Cyberwar (NY: Oxford UP, 2014)
Damien Van Puyvelde, Aaron Brantly (eds.) US National Cybersecurity: International Politics, Concepts and Organization (DC: Georgetown UP, 2017)
Frank Webster, Theories of the Information Society (L: Routledge 2014)