This is not an immigration question.

If I marry a green card holder, can I study in the USA and adjust my status while there? How long till I get my legal rights?

If you also seek F1 visa, yes.

I agree. You should hire an immigration attorney and clarify some issues for yourself. Better yet, hre the attorney to handle the case for you.

My freind was approved for defered action for childhood arrival . she live in massachusetts , immigration

No, but she should be asking this question, not you.

I agree with my colleagues. You should not be affected. You should satisfy the judgment nevertheless.

Can I apply for a J1 visa again?

I would want to review the entire record before giving you an answer.

Hy i am 22 years old L2 visa holder and according to the visa stamping my visa expires next year so m i eligible visit us on L2

Yes, if you are still the spouse of a gainfully employed L1 employee, performing the same duties with the same employer.

Will I be granted a spouse visa to Hungary?

I agree with Attorney Segal. Visas to Hungary are amongst the least concerns we have here on AVVO.

Change of citizenship when R-1 petition is processed.

I agree with both colleagues of mine. It should not matter unless you end up in administrative processing which may take forever.

Is cancellation of removal easier to get approved if individual is a LPR versus an illegal immigrant (w/ same criminal records)

I agree with my colleagues, yes.