RFE on STEM extension: Employment Relationship to Field of Study

You need to show how your job is related to your field of study.

I want to apply for my sister Form I-130 (alien relative). Can she still apply for tourist visa B2 visa awaiting I-130?

She may get a hard time when applying, because of a filed I-130.

J1 to F1 almost no time.

You cannot change status if the two-year requirement applies to you.

If you mean joint sponsor, then you equally are on the hook for support of the beneficiary Along with petitioner.

H1b Change Client & Location but Employer is Same, Do I need to file complete new petition.

If the job requires a new LCA then it also requires a new h-1b petition.

PERM filing

Only one of the required recruiting steps can cur within 30 days of filing.

What steps do I need to take to prevent any wrong doing on my behalf if my green card spouse abandoned me after receiving card

If he has left the US, your I-864 obligations might be ended.

K3 visa

Depends on how fast they process things. Best to check directly.

FileI-130 and I-485 together for a parent?

Because your mother is your "immediate relative," an immigrant visa is always available Therefore you may send in I-130, I-485 and I-765 all at...

Welcome letter and about to move to a new apartment(address) in about a week.

I would stay at same address until green card arrives if you can. After you move, remember to report new address using AR-11.