The first step in your US visa application process is to fill DS-160 form online. It is also the most important step as the result of your visa to the most part depends on your DS-160 form.
DS-160 is a very lengthy form, so it can take you a few days to complete. So, start your US visa process early. You can also save and come back to your DS-160 form at any time.
During the interview, you may not be asked to present any documentation at all. In that case, your US visa result would be completely based on what you have entered in your DS-160 form and what you say during the interview.
Even if you are asked to present any documentation, the visa officers may compare what you have on the document with what you have entered in your DS-160 form. If any piece of information does not match, you may be asked to justify or your visa may be denied.
Therefore, filling your DS-160 form with highly relevant, accurate and honest information is very much necessary. Pay careful attention to every piece of information you enter in your DS-160 form.
I have listed out all sections and questions in this guide. For each question, there is a comment explaining what exactly needs to be entered.