In the New York City police Department (NYPD) Regarding Protest in the NYPD, what might police in other places learn from NYPD? What should they avoid that NYPD does?

Police departments all across the country have policies dealing with how to handle protests and demonstrations. In New York City, the policy is to try to protect the First Amendment rights of all people at a demonstration. People have the right to voice their opinion, whether it is popular or unpopular. All police departments should follow this policy.
In New York City, there is no set policy regarding how many police officers would be present at a protest. Generally, the larger the anticipated number of protesters, the larger the police presence will be. While it would be nice to have some set guidelines, it is often difficult to determine the exact number of protesters who will arrive. Generally, the main goal of the NYPD will be to protect the public as well as members of the police force.
The NYPD will meet with the people who want to protest in advance of the day of the protest. They will ask for information about the protest, including collecting flyers and other printed materials. They also will look at the past history of any group that wants to protest. This is a good policy for all police departments to follow.
The NYPD also will establish what is known as "barrier pens" in order to effectively patrol the protesters and maintain some control over them. This may or may not be effective in every city. Other cities have tried to establish a perimeter area in order to control the protesters instead of using "barrier pens."
In New York City, any protesters who break the law will be arrested. Any person arrested will be taken to a mobile facility for processing.
Developing a police policy for demonstrations for a given city depends on many factors. What may be good for one city might not be effective for another city.
https://sfbos.org/police-facilitation-mass-protests