DS-230 instead of DS-260?

It has to be DS 260, NVC is fixing the glitch

No response after green card interview

You did not specify the category you filed under and had interview for. If it was for Marriage based GC, then it could take long time, sometimes...

What type of document's photocopy I should send to USCIS

If you can make color copy of biographic page of passport, it will help and any other photo ID issued by government of USA or your country will be...

Which would be faster or better option for getting my son's legal/valid stay in USA

You should file your son's renewal of Green Card and if you are eligible for citizenship, you should apply for N400 (citizenship). If you become...

If my pre-completion OPT (I-765) is approved, but I change my mind and decide not to work, can I just continue my studies?

If you are not interested, you can always request to withdraw your application

F1 student applied for I-130 with US citizen marriage.We annuled our marriage.

Yes, you should send a detailed letter explaining the reason for annulment and attached documents and request withdrawal of I-485, I-765 and I-131.

DS-160 error

She can correct it at the time of interview and explain the mistake.

I was married in India ,then I came to USA for work, my spouse does not want to come to US and live with me,can I get a divorce?

You need to contact a divorce lawyer

What will I have to do now that I am married to a us citizen

You should consult an Attorney. if you have entered USA on a visa when you came first and never left, you can file I-130, I-485, I-765 and I-864....

It all depends on your new employer, PERM is a prospective employment and can be started without filing for transfer. if you are joining a small...