Case study/data set for stringr and lubridate (R Studio)?

Hello dear users,
I have to do a presentation and term paper on stringr and lubridate next week. I know what both functions are about. Anyway, for my presentation/term paper I have to use a case study/data set to demonstrate the respective packages.
I asked my tutor of course and she sent me a link to two ZIP files ( 20 Newsgroups )
I tried to import them into R Studio to get an overview, but somehow it doesn't quite work (I guess) -> See screenshot.
So the question is whether anyone has experience with this and can explain to me what I need to do or whether anyone has good links for case studies to use or similar. Of course I have already asked chatgpt etc., but nothing useful comes up.
If background information is needed, I can of course provide it.

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