After getting married ,when is the right time to file for i130 ?

There are many factors to consider. Starting with when your DS-2019 expires.

Can I leave the U.S. right now on OPT?

I just attended a webinar on Taiwan ... double-check your information about international travel. Also, do NOT work remotely for a US employer...

When is US Consulate going to open in India?

It is not necessary to repeat your questions.

When is US Consulate going to open in India?

No one has this answer. I've heard June, or July, or August or September.

How can I move to Canada

Go to www.ailalawyer.com and search for someone with a license in Canada.

Who has been accused of the DUI? The greencard holder?

What to expect in immigration court. Will I get deported after I appear in the court?

"Wanting" to stay in the US is not enough. Talk to an attorney for an evaluation of your asylum claim.

Can i easily renew my student visa?

You need to talk to your DSO about filing for reinstatement.

Can I request an extension for my mother on her B-2 visa due to COVID-19?

Yes, you can file form I-539 to extend her B2. Don't get greedy .. only ask for 405 months.

My Sister's travel Visa to US got rejected

No, there is no way you can 'bring' her to the US. She just needs to talk to an attorney via Skype to be better prepared for her B-2 visa...