Comment by DonaldPShimoda

Yeah, deciding on your assumptions about the audience's prior knowledge is one of the toughest parts of presenting information well, I think. If you give too much info, you come across as boring or patronizing; if you don't give enough info, most (if not all) of your audience will rapidly lose interest. But it's all gotta be based on your exact audience in the moment, and that's really hard to take into account a lot of the time.