Why is it important to be aware of bias when reading history?

i do know a few reasons, but it'd be for someone else's input. for any !

It is important that people are aware of the bias for us to know which are true and which are fictitious, so that we have proper information of the story, To avoid any misleading information. 
 
this was my answer in my last history essay,
hope it helps :) 

Theodore James Franco Gatsby--- I'm pretty sure never mind- I read it wrong-