If you are amongst those who were previously issued a United States visa, make sure that you will be able to get approved for a new application.

There is some fine print you will need to read carefully - such as the J1 visa for students and interns, which states that you might need to wait at least 2 years before applying again for a United States visa.

To my knowledge this was only concerning specific situations: visas sponsored by the home country (e.g., if you have student benfits or the like), but the issue was raised during my application so make sure you are within the requirements.