Shipping - short for relationshipping, is the act of rooting for romantic relationship between two fictional characters, often by a loyal subset of viewers, readers of said fiction eg: Johnlock - sherlock holmes and john watson from sherlockholmes; merthut - merlin and arthur from merlin, etc.
Canon- as in literary canon can be narrowly defined as that which is accepted as authentic, or official in the context of the literary piece / writing of a particular author, which are considered by scholars and critics in general to be the genuine creation of that particular author; this is based on some already deduced rules intended to be applied on the future pieces in the same genres.