If I change job or travel out of US after I submit the N400, should I inform USCIS? if so, how? thanks

Generally, changes in circumstances after filing the N-400 application for citizenship are stated to the immigration officer at the time of the interview. You do not have to notify USCIS of any changes in your circumstances affecting jobs or trips outside the US at this time. If you are changing address, however, you should inform USCIS. Due to the limitations of the Lawyers.com Forums, Alan Lee & Arthur Lee, Esqs.’ (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.