What are non lexical linkers? And how to fill them according to thetext

The term 'non-lexical' means 'not relating to words. There are fillers that are meaningless and mark a pause or hesitation in speech or verbal communication. For example: 'uh, okay, umm, hey, etc.' One has to read the text as a whole for any non-lexical fillers to be used. They must fit into the context.