Yes you may travel to LA with your visa.

Am I the principal Applicant? or Derivative Applicant? Besides Form I30 and I- 485, do I have to file form I-944 and I-864?

You are the principal applicant and will need to submit the I944 along with others.

Hello, I would like to know how the recent travel ban affects my friend?

The travel ban won’t impact him as much as the fact he will require a waiver for unlawful presence. Consult with an attorney for guidance.

Can I leave the United states with pending B2 I-539 ? AM i eligible to get a visa in the future? Can I leave before 180 day?

Yes you may depart the US but should continue to receive mail.

With an expired resident card can I file for unemployment?

Yes this will not impact your immigration status.

Is there any deadline to submit I485?

It depends on whether you are eligible to file for I485 at this time. Consult with an attorney for guidance.

How can I find the USCIS receipt number to file the form I -539 .

You should not need the receipt number to file an initial extension. For assistance with such an extension, best to consult with an attorney for...

Filing for N400?

You will need to file your application based on your residence and cannot shop for the best service center. It is best to refer to the form...

Do we need to file extension of B-1 visa with pending extension ?

It depends on when the initial extension was applied for.

Yes, given the information provided you may file for an extension.