On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.
Off-Topic: Most stories about politics, or crime, or sports, or celebrities, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic.
Not sure that 'fat fingering' on a mobile device rises to the level of tech-related opsec. The choice to use a non-government approved device certainly is news, but not necessarily Hacker News. Plenty of better places to debate it.
Is this the forum for this type of news?
https://news.ycombinator.com/newsguidelines.html...