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On screen
After the Oath, keep your certificate safe. Then get a U.S. passport.
Lesson words
You took the Oath. Now you are a U.S. citizen. The paper they give you is your Certificate of Naturalization. Take a clear photo of it. Put the paper in a safe place. Do not laminate it if a later office says not to. Do not post it on the internet. You gave back your green card. That is normal. Do not try to travel on the old green card. Do not let anyone keep your new certificate. Go one step at a time. You already did the hardest part the legal way.
This is education. It is not legal advice. Only USCIS decides your case. Government forms are free at uscis.gov.