If you are a student and worked in the U.S.A., you should file a tax return. Actually, there are two tax returns: Federal (IRS) and State. And here it get pretty complicated: each state has slightly different rules, so for each state, there is a different tax return.
A really easy way is to use an online application by NeoTax. Looking like a questionnaire, helps you prepare the tax forms in less than 10 minutes, with price starting at 19 €. This video shows you how easy it is! Contact us at email@example.com and we will send you the link as soon as the U.S. tax office will issue forms in January 2020.
You can, of course, do it on your own, or with help of your employer, or find a tax preparer in the U.S.A. (and be ready to pay approx. 350 USD).
Watch out for our new website comming soon: www.NeoTax.eu.