The Path to Dependent Origination

In terravada Buddhism, you pay attention to the three characteristics of impermanence, not self and unsatisfactoriness. This does produce profound changes in your phenomenology, but then what comes after that? And I don't think I had a good guide to that, but now I'm starting to think that in it's very controversial to talk about pre-normative or pre-sectarian Buddhism before, you know, before the polycanine or something.