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.(Example)
("Yesterday I saw a deer, a sparrow, and a nonfiction book.")
A classic joke:
"Let's eat grandma!" vs.
"Let's eat, grandma!"
"Commas save lives!"
😂 Hope that helps a bit! You're doing great though, don't worry. :)