Try to share your insight in whatever topic you are an expert. (Or a semi-expert. For example if you see me commenting about biology, please double check the info because my biology knowdledge is not so strong.) Sometimes a good question is also helpful to get a good discussion.

> if you have any other helpful suggestions

There is a lot of folckore, I'm not sure if it's collected somewhere. Some random links:

Welcome page: https://news.ycombinator.com/newswelcome.html (It's shown only once. I'd prefer it were linked somewhere in the site.)

Launch HN recomendations: https://news.ycombinator.com/yli.html (It's writen for internal use of YC companies, but if you ignore the specific parts there is lot of good recomendations.)

Undocumented HN features: https://github.com/minimaxir/hacker-news-undocumented (It's an unofficial list of features mantained by minimaxir.)