[cimmanom]

Hyperlinks. Yup, the original raison d'etre of HTML. One site that discussed a topic would link inline to other sites or articles about the topic. Or one silly site would link to others.

In the heyday of the early blogging movement, "blogrolls" (links to other blogs the author followed) were common. So were archives categorized by date, category, and eventually tags. And "related posts" widgets.

As to where you could get started, a topic in mind and a search on your engine of choice would usually get you going. Or a visit to the Yahoo directory. Or bookmarks of your favorite frequently-updated sites.

I'm not sure exactly what skill you're looking for. A skill for finding things to read/watch to keep you occupied? Doing research or finding answers to questions online? Something else?