Capitalization and Usage of Commas

Which letters should be capitalized in the following sentence?

apple is extending its retail store closures in china due to the coronavirus outbreak.

Which letters should be capitalized in the following sentence?

the robot mascot for tokyo's 2020 summer olympics was unveiled by toyota as reported by the bbc.

Which letters should be capitalized in the following sentence?

according to researchers at the university of nevada, facebook is the biggest time-sink.

Which letters should be capitalized in the following sentence?

the latina superstars’ performance at the super bowl flooded instagram.

What are the places to use a comma/commas in the following sentence?

Steve Jobbs the founder of Apple Inc was also a talented calligrapher.

What are the places to use a comma/commas in the following sentence?

The Valedictorian spoke coherently eloquently and confidently.

What are the places to use a comma/commas in the following sentence?

When I opened the kitchen door the rogue cat jumped in.

What are the places to use a comma/commas in the following sentence?

I am on a Keto Diet which means I eat broccoli lettuce mushrooms and smoked salmon every morning.

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