I fooled arround with it for a bit and now I'm at 740 points (still less than one karma a day). But mostly through consistent commenting and most of my comments remain at 1 point XD. Helping out with a wesite hugged to death by posting a google cache link makes people happy though.
but yeah, nobody cares about internet points.
Getting down to your question, you need to be informed (a.k.a. confident) or curious about the topic of the thread you're contributing to get karma points, I guess.
I'm only just now graduated from college and working as a consultant, so never had a ton to add. Also I'm not technical, don't code, so a lot of the topics I read about here I am not close to qualifying to comment on.
Though it would be nice to get enough karma to downvote, probably gonna take 10 years to get there haha!
[I guess you know, but I'll remind you anyway. Try to avoid jokes and oneliners.]
For example in last 2 years (After 2 years I got tired of scrolling through my history):
[32] Talking about a field I know a good bit about: https://news.ycombinator.com/item?id=10150020
[38] In response to people freaking out over nodejs numbering: https://news.ycombinator.com/item?id=10477878
[49] In response to SV entitilement: https://news.ycombinator.com/item?id=13062611
[49] Being open and opposed to "Things were fine back in my day"-thinking: https://news.ycombinator.com/item?id=10182611
[57] How I use GMVault: https://news.ycombinator.com/item?id=12987670
[57] Talking about Bittorrent Sync: https://news.ycombinator.com/item?id=9534850
[58] On a new taxi app and how that article was overly-glowing: https://news.ycombinator.com/item?id=10676957
[66] Wishing for VR virtual desktops: https://news.ycombinator.com/item?id=9701776
[88] Complaining about google not hiring the homebrew dev: https://news.ycombinator.com/item?id=9695416
[114] Responding to a snarky blog on how "easy" it is to build an app: https://news.ycombinator.com/item?id=12137433
[217] Response to FBI's stupid statements on encryption: https://news.ycombinator.com/item?id=9661936
For each one of the comments I made above there were probably another 5 that got 1-5 votes and then another 20 that never got a single vote.
Like I said at the start I don't pay much attention to it at all and if you do you probably are on HN for the wrong reasons. Just comment when you have a valuable opinion or information to add to a discussion and let the chips fall where they may.
karma: 3079