F1 to H1b gap

Yes you can work as long as your opt is valid but not after that unless the H-1 is granted. Can you get a STEM extension?

What are the major alteration made to h1b visa recently

There have been no changes to the H-1 category recently.

F-1 students can definitely be "discriminated" against.

I am currently on Stem opt. My employer filed h1b for me and is picked in the lottery. Employer wants to withdraw application

You will still be in status but you need to file your stem extension immediately.

You and your spouse have at least one attorney you can talk to about this. AVVO is for people who not have attorneys. You cannot work when the...

You need to speak to your attorney. Many people do not realize it but immigration attorneys represent both the employer AND employee, whether they...

It is never a good idea to travel anywhere near your sixty grace period. There is a very good chance you will not be admitted again.

Can I apply for green card (employer sponsored) while waiting answer on H1B extension?

You have several options available to you and you are getting some very bad advice.

Valid visa till June 30, 2017. Extension got Denied!

You need to consult with a Board Certified immigration attorney rather than the mostly incompetent attorneys most job shops use.

Can I file for a green card for my wife she is on an F1 student visa here in the US and we got married in Nigeria

Assuming you are a US citizen or LPR, yes, you can file for her.