Commas with Items in a List

I cooked and cleaned and went shopping for my elderly aunt.

Correct

The fire began because of an electrical short circuit.

Correct

Dennis Talia and Giuseppe volunteered to rake the park.

Dennis, Talia, and Giuseppe volunteered to rake the park.

I believe that large old colorful rug was woven by my grandmother.

I believe that large, old, colorful rug was woven by my grandmother.

Jogging took him around the lake up a steep hill and across an empty field.

Jogging took him around the lake, up a steep hill, and across an empty field.

Kanoa's winning painting was of a scarlet rose a yellow tulip and a blue iris.

Kanoa's winning painting was of a scarlet rose, a yellow tulip, and a blue iris.

She baked a loaf of bread she made soup and she cut up some fresh berries.

She baked a loaf of bread, she made soup, and she cut up some fresh berries.

The hurricane season brought hail high winds and thunderstorms to the coast.

The hurricane season brought hail, high winds, and thunderstorms to the coast.

The main ingredient in Katya's salad dressing is delicious tangy blue cheese.

The main ingredient in Katya's salad dressing is delicious, tangy blue cheese.

The thick black clouds gathering overhead threatened rain at any moment.

The thick, black clouds gathering overhead threatened rain at any moment.