If you just got a warning then you are lucky. If the officer issued you a ticket for that violation it would carry points.

Is there points for ticket 3-94-1 in NJ?

This does not appear to be a valid citation.

What exactly is a post conviction relief? Can it stop my sentencing (IDRC, Community Service, Surcharges)?

Post-conviction relief is a method to reopen older cases based on narrow grounds for relief. You should retain an attorney if you are interested...

Will I be doing jail time ?

You already asked this. You need to retain counsel to reduce jail time and see if there are defenses.

Stopped for speeding, Officer gave me 'Careless Driving' ticket and told me to plead guilty?

The officer is right. An attorney may be able to get you a lower fine with zero points.

What should I do? Pay the fine or appear in court?

This looks to be a park ordinance for disorderly conduct. Might be wise to talk to an attorney about minimizing the penalties.

Will I be going to jail?

Get an attorney to have the best chance of mitigating penalties and avoiding jail time.

Person accuse you of harassment (not sexual) court dismisses, and file expunged. will that effect the renewal of Green card.?

You should raise this question with an attorney that specializes in immigration law.

Why are cases downgraded?

The county prosecutor reviews all indictable offenses brought before him to determine whether they stay at the county level or are kicked back. ...

For a third degree crime there is exposure to prison time. If the individual is trying to engage in a custody dispute it might not be a bad idea...