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On screen
Make copies. Keep originals. Write dates. Do not give your only papers away.
Lesson words
Before you file, make a simple file. Photo of your green card, front and back. List of trips: date out, date back, country. Tax years you filed. Letters from USCIS. A copy of the N-400 you send. Keep this file on your phone and on paper. Do not give the only copy to a helper. If USCIS asks a question later, your file is how you answer with proof.
This is education. It is not legal advice. Only USCIS decides your case. Government forms are free at uscis.gov.