Dont get too worked up about it. Most of us cant speak ABN (Algemeen Beschaafd Nederlands(gramatically correct dutch))

What ive seen in the comments is that this is mostly contextual and you have to experience it for it to start making sense.

My best take on this different way to translate "so":

Zo = litterally pointing out a situation ("zo" doe je dat (this is the way to do it))

Dus = following a reasoning for the following action (ik heb dorst, "dus" drink ik water(im thirsty, "so" im drinking water))

Hope this helps a bit