How do I reflect Stock Profit and Dividend in New York State Tax 2020

Please help me

1. I googled how to reflect stock profit and dividends for New York State tax, but it led me to New York State tax website I was unable to understand.

2. Few days ago I called New York State tax. The gentleman put me on hold. When he returned, he said his Supervisor said I should ask IRS.

3. Today I called New York State tax. The gentleman put me on hold. When he returned, he said I should report it to the IRS taxes, then New York will be informed.

I am really confused. Before I call IRS or anyone else, can you tell me what I am overlooking? Thank you kindly.