You nailed it here! :)

Commas basically go where you want to separate two thoughts in a sentence or “take a breath” without the full stop of a period. They also often separate objects in lists, or signify that you’re talking to somebody.

A classic joke:

“Let’s eat grandma!”

“Let’s eat, grandma!”

“Commas save lives!”

😂 Hope that helps a bit! You’re doing great though, don’t worry. :)