In general, here is a summary of what 'Knowledge & the Knower' actually means in TOK + why we are concerned about it:
Knowledge & the knower is the ‘core theme’ of the TOK course, dealing with YOU as a knower about the world, inviting you to think about things like what shapes your perspectives, where your values come from, and how you navigate the cognitive world.
It also looks at which ‘communities of knowers’ (or epistemic communities) you might belong to, and how these affect your understanding of the world. These epistemic communities might be anything from the religious organization you are a part of, to the football team you support.
It therefore interlinks extensively with the areas of knowledge and the optional themes.