In a lot of ways, HN's intentionally aescetic design works against itself. People can be here for years and not notice features because the grey on grey layout encourages feature-blindness.
It helps when you view it like a graph of people making commitments of their opinion. You can checkout a commit by clicking on the time and then run the commands by clicking on their label. There are also the plumbing commands like 'latest', that you only find, if you know them.