You can continue to use EAD until your I-140 is denied. The order of events should be L-1 Denial > I-140 Denial (although not connected to L-1) >...

Approved H1B petition revoked

I disagree. You are not subject to CAP, unless petition was revoked due to fraud. Email confirmation with receipt number is not the best evidence,...

H1B Transfer

Its is not as simple as you think. 1. Employer A can file LCA. But what is that for? If there is a material change, an amended petition is...

Can I travel while my H1-B transfer is pending and I've already left my previous employer?

You can travel/re-enter on a valid visa through your previous employer, but would have to use your new employer's H-1B approval notice at time of...

Is it required by law to enter USA on H1B permanently or allowed to make short visits?

What is required is that: When you enter US on H-1B, you have to comply with terms of H-1B (that was filed on your behalf). Its a dual intent visa...

How does moving to new location impact GC processing

Green card is for future position. So your relocation normally would not impact that. There could be several associated issues with your move....

If you have pay-stubs and have been maintaining status, I see no problem in joining start-up. The new case will be adjudicated on its own merits.

Was asked my age during an interview and I refused to answer then he sent me on my way. What can I do about this?

What interview are we talking here? Please provide more facts.

Non immigrant principal alien

Yes. J-1 is principal alien and you are dependent alien (aka dependent spouse).

RFE on L2-EAD

The RFE Notice should have a PO Box Address and separate address for courier delivery. You can choose anyone. FedEx is just fine.