system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When someone uses these brackets [] in journalism?

Alright so lets say for example

"[He] went to the corner store to get a chocolate bar, it wasn't much later until he realized he didn't have change in his pocket"

Why do they always put a particular noun in those square brackets like that?

I hope this makes sense, if not I can provide a link to an article using this...
gpt
When you quote someone, sometimes it may not be clear what is being talked about without including other parts of the quote that aren't otherwise needed.  The brackets are used to clarify what is being talked about in a quote while making it clear that the words within are not actually the original speaker's words.