Okay kiddo, so a knight banneret was a really important type of knight back in olden times. Back then, knights were people who fought on horses while wearing armor to protect themselves.
Now, a knight banneret was even more special because they had their own flag, or banner, that they carried into battle. It was really important to have a banner because it helped people know which side you were fighting on.
But being a knight banneret wasn't just about having a flag. It was also about being really brave and important enough to be in charge of other knights. See, a knight banneret would lead his own group of knights in battle, and he was allowed to make decisions even if there were other knights who were older or more experienced. It was kind of like being a boss!
To become a knight banneret, you had to do something really impressive in battle. Maybe you saved a whole bunch of people or you captured an important enemy. Whatever it was, it had to be really cool and impressive.
So that's what a knight banneret was all about. A big, brave knight who led a group of other knights while carrying his own special flag. Pretty cool, huh?