You can spend the entire first year of a Dh degree trying to come up with a defition ;) for some it is humanities with digital methods, for me Dh is the study of the intersections between digital technology and society. So I’d work on decentralised networks, plus the ideology behind it. Also I do some web archiving, and try to argue for public access to web archives .

Have a look at https://journalofdigitalhistory.org/en , I think it’s a good example of a Dh journal