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Thanks for the super quick confirmation!
From January 2024 on, I will also receive a german research scholarship. The scholarship is directly transferred to my German bank account, as they dont transfer abroad. The scholarship is always tax-free in Germany. In addition to the scholarship I will receive a small salary from the US University, from which they automatically withhold taxes, health insurance etc.
1. I assume, I need to pay taxes in the US, even though the scholarship is tax-free in Germany?
2. If so, do I need to register for quarterly tax payments in regards to the scholarship here in the US?

3. How do I know the amount of taxes to pay on the scholarship?

4. For my 2024 tax filing (I am then considered a resident alien), I add the scholarship as additional income? 
Thanks again!