Your question is broad and vague. Speak to a lawyer with more specific concerns and share documentation.

You must be invited and have interview notice to attend immigration or consular interviews, The only exceptions are lawyers and translators with...

You cannot, only the government can. Your concerns and fear are family issues not immigration and may be resolved in family court. Contact a family...

Yes, you may but the COS to F-1 is considered abandoned and subsequently denied.

The validity date on the current I-94 is what you go by. You may consult with a lawyer for additional question(s).

The island of PR is part of the US and considered domestic flight/travel.

In general employment authorization is required. Consult a lawyer for advice..

We know very little about you. You should consult with a deportation lawyer for guidance.

The processing times for N-400 is about 12.5 months. Any other esteems may be localized and unreliable. For immigration purposes, the question you...

I am unaware how changing jobs would cause NATZ problems. You may change jobs as you please.