[Question] How to create a "token of a token" through the Ethereum sidechain/network?

Hello,

I am getting started into learning about blockchain technology and things of that sort.

One of the things I was interested about when coming across Polygon when studying about sidechains, networks, altcoins, etc. Is that with Polygon you are able to create tokens through their network even though they are through the Ethereum network already.

Basically my question is, how can one create a token (network) through the Ethereum network like Polygon that also allows other developers to create tokens through your tokens (network)?