could someone ELI5 for this ignoramus?

It sounds like JWST found a galaxy where one wasn't expected to be for the time in which it takes light to reach where JWST is?

I assume it's important because we expected nothing and there was something?

But I am just guessing, honestly

It's a galaxy far far away and more importantly very very old. The image is 13.5 B years old, the photons were created just 280 million years after big bang. It's the oldest thing we have seen so far. And it looks mildly different than what we expected to see