You are not limited to only courses from your certificate program. You have the opportunity to explore and enroll in courses outside of your certificate program. For example, if you are doing a User Experience and Web Design certificate, you can also enroll in courses from the Business and Leadership certificate.
Please note that units outside of your certificate program will not be counted towards your program, but will count towards your 12 unit quarterly requirement. All students with F-1 status must be enrolled in a minimum of 12 units each quarter (except in their final quarter).