Okay kiddo, so let's imagine you have a bunch of toys and you want to know how many you can fit in your toy box. You start putting them in one by one, but there are so many toys that you can't count them all.
That's where the set-theoretic limit comes in. It helps you figure out how many things you can fit into a set, like your toy box, without having to count each individual thing.
Basically, it works like this: imagine you have a bunch of sets, each with a certain number of things in them. You want to figure out what the biggest set is, but you don't actually need to look at all the things in each set.
Instead, you can just compare the sizes of the sets. If a set is bigger than another set, you know that it can't be the biggest set, and you can ignore it. You keep doing this until you've compared all the sets, and the biggest one left is the set-theoretic limit.
It's kind of like playing a game of "which is bigger" with sets instead of numbers. And once you know the set-theoretic limit, you can use it to answer all sorts of questions about sets, like how many things you can fit in your toy box!