Primary Residential Parent

What is this term and does it take any right away from the other parent?
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1. Can someone pls explain to me that term

2. In a split schedule parent A makes 55,000 and parent B makes 86,000, does anyone pay CS?

3. Parent B is going after parent A's Bachelor degree (I believe) or is it the potential to further parent A's education parent B is going after? We are clueless?

They are fighting for custody in a divorce in Long Island,NY

Long Island, NY

It is up to "both" parents to support their children. One can make a million dollars and the othe under 20 grand. Both parents are financially responsible for any child(ren) care. How much so is usually decided by a judge