The Common Application is an online college application platform that is accepted by more than 900 colleges and universities in the United States and other countries. It allows students to apply to multiple schools using a single application.

Here are the steps to fill out the Common Application:

1. Create an account: Go to the Common Application website and create an account by providing your name, email address, and a password.

2. Add colleges: Once you have created an account, you can add the colleges you are applying to by searching for them in the "College Search" tab.

3. Fill out the profile section: The profile section asks for your personal information, including your name, address, date of birth, and high school.

4. Complete the education section: The education section requires information about your high school, including your GPA, class rank, and test scores.

5. Add activities and honors: In the activities and honors section, you can list any extracurricular activities you have participated in, as well as any awards or honors you have received.

6. Write the essay: The Common Application requires one essay, which is used by all of the colleges you apply to. The essay prompts change each year, so be sure to read them carefully and choose the one that best suits you.

7. Request transcripts and recommendations: You will need to request transcripts from your high school and ask your teachers to write letters of recommendation for you. You can do this through the Common Application.

8. Pay the application fees: Each college may have a different application fee, so be sure to check the fees for each school you are applying to.

9. Review and submit your application: Before submitting your application, review it carefully to make sure all of the information is accurate and complete.

10. Check the status of your application: After submitting your application, you can log in to the Common Application website to check the status of your application and see if any additional materials are required.