Okay kiddo, let's talk about a big word: ostentation. Basically, when someone is ostentatious, it means they're trying really hard to show off and impress other people.
Imagine you have a new toy and you really want everyone to know how cool it is. You might start showing it off, talking about it a lot, and maybe even exaggerating how great it is. That's kind of like what ostentation is, but with bigger things like fancy cars, expensive clothes, or big houses.
Now, some people might think being showy and flashy is cool, but others think it's kinda obnoxious. That's where discourse comes in - it just means people talking and sharing their opinions about something. So, a discourse on ostentation would be when people talk and argue about whether it's good or bad to be super showy with your wealth and possessions.
Does that make sense, little one?