There are many ways to use commas. Here are a few rules for using them:
Dates
If there is a date that is written with a year, we use a comma between the date and year:

I moved to Chicago on April 15th, 2016.

Her son was born on January 14th, 1998.
If there is no year written, we do not need a comma:

They are going to get married on June 1st.

The essay is due on November 8th.
We also use a comma if a day of the week and date are written together:

Louis will arrive in New York on Wednesday, September 6th.

The Inland Northwest Car Club will have a show on Friday, October 20th.
Names of Cities and Countries
Commas are used between the names of cities and countries:

These cars are built in Nagoya, Japan.

Paul and Thomas have lived in Brussels, Belgium for one year.

My mother wants to visit America's Car Museum in Tacoma, Washington.
Commas are also used between a city and a state, province, or region:

My cousin has never been to Los Angeles, California.

My uncle met the mayor of Hermosillo, Sonora.

Vancouver, British Columbia is a beautiful city.
List of Three or More Words, Phrases, or Clauses
When we write a list of three words, phrases, or clauses, we use a comma:

They towed a coupe, a sedan, and a truck to the shop.

I looked for my keys under my bed, in my closet, and behind my dresser.

He woke up, brushed his teeth, and took a shower.

Peter works on bodies, Eric works on engines, and Sarah works on interiors.
Introductory Words or Phrases
We often uses commas for a word or phrase that comes first, or introduces a sentence:

Yes, I love watching movies!

In my country, there are many large cities.

Later, we talked about her plans for the future.
Exercise
Open the exercise to begin the activity. Follow the instructions in the document.