You should submit a tax declaration regardless. Either it’s required, or you’ll most likely receive a refund. So no, there is no harm; on the contrary.
Since the original poster likely won’t do this anyway, this discussion is pointless.
As a takeaway message: Just submit your tax declaration, even as a working student. In most cases, you’ll get some money back. And send it to your Finanzamt (tax office), not the IRS. The US won’t process your German tax declaration.
Cheers
There’s no need to be perfect. Just apply, you’ll learn most on the job. Languages are just tools and most are similar, especially in the java, c#, js, python world. You can also take the initiative and apply to companies without open Werkstudent positions