DALLAS and DYNASTY vanished after the 80s, but they had already infused serialization into prime time, both dramas and sitcoms. Before, and even in early DALLAS, episodes were stand-alone or two-parters at most. I can see the confusion because the 80s soaps reshaped the landscape so that now an ongoing narrative is the rule and stand-alone episode series the exception. Networks used to be wary of such formats because it was harder to run them in syndication, but first with DVD and now streaming, it is actually preferred by many people for binge watching. In short, you are justified in feeling lost.