No, you cannot engage in other income-producing activity while on an L-1 visa.

I agree with Prof. Capriotti. You cannot enter on a nonimmigrant visa for the sole purpose of filing an immigrant visa.

I agree with my colleagues. Your interview will be held based on the physical address of the beneficiary. You cannot select the field office to...

My form I-485 was denied because I didn't submit my affidavit of support. Do I file a motion or do appeal?

You must re-file your I-485 and pay another application fee, including the biometrics fee. Your situation is exactly why I recommend either...

Is it possible to convert an approved H1B from consular processing to change of status now?

Yes, you can apply to adjust your status in the US but premium processing has been suspended. You will have to wait for months.

When can you apply for permanent residence if you are subject to the 2 year rule from a J1 visa (left the US June 2019)? ?

The only thing that I would add to Prof. Capriotti's answer is that you may be eligible for a waiver of the J-1 residency requirement. See this...

No, you cannot do what you have planned. Currently, all consulates are closed until at least June 4. When you are issued the F-1 visa, the...

I agree that you need to consult with an experienced immigration attorney who can represent you successfully in obtaining your green card.

Send them a letter sayigng that you have never married.

Does the President's Apr 23 immigration proclamation restrict USA entry for a tourist with an existing tourist visa ?

No, it does not apply to persons holding a tourist visa before April 23, 2020.