I received fellowship to study outside of the US. Which deductions apply? Which home address to use to file if living abroad? How do I to report health insurance?

I was strictly a student receiving fellowship income for study. Which deductions apply, if any? I was following guidelines for Fulbright student grants and saw guidelines changed in 2017.

Are there penalties for not setting up estimated tax payments? I did not do this prior to departure as I was unaware of it.

I had international health insurance through the program. I am unsure if it qualifies for tax purposes. How do I report this?

I was not abroad long enough to quality as an abroad residence. Which home address do I use when reporting, the one abroad or in the US?

Thank you!!