This is indeed the first rule. And offer useful feeds too. If you’re a newspaper, hardly anyone will be interested if you offer just one “firehose” feed of ever

This is indeed the first rule. And offer useful feeds too. If you’re a newspaper, hardly anyone will be interested if you offer just one “firehose” feed of everything you publish. A nice example on how to do it is The Guardian. Basically any category page you can visit is also a feed.