New York State Constitutions & Conventions:
http://www.archives.nysed.gov/research/constitutions-and-constitional-conventions#:~:text=New%20York%20has%20adopted%20four,times%2C%20remains%20in%20place%20today
Statutes, Bills and Legislative History
NYS Legislative Information
http://public.leginfo.state.ny.us/navigate.cgi
NYS New York State Bill and Veto Jackets (New York State Archives; 1995-2011 click on "Collections" to browse)
https://digitalcollections.archives.nysed.gov/index.php/Detail/collections/7782
NYS Consolidated Laws (New York State Legislature)
http://public.leginfo.state.ny.us/lawssrch.cgi?NVLWO:
New York Consolidated Laws (Justia)
http://law.justia.com/codes/new-york/
Consolidated Laws of New York (Findlaw)
http://codes.findlaw.com/ny/
Regulations
New York State Register (New and proposed regulations;2003-current)
http://www.dos.ny.gov/info/register.htm
New York Codes, Rules and Regulations (Unofficial)
https://govt.westlaw.com/nycrr/index?__lrTS=20160301001332493&bhcp=1&transitionType=Default&contextData=(sc.Default)
Opinions
New York Attorney General Opinions
http://www.ag.ny.gov/appeals-opinions/introduction-opinions
NYS Court of Appeals (Current Decisions)
http://www.nycourts.gov/ctapps/decisions.htm
New York State Office of the State Comptroller Opinions
http://www.osc.state.ny.us/legal/
New York Official Reports, NYS Law Reporting Bureau (Court of Appeals, Appellate Division and lower courts)
1990 to current
http://www.courts.state.ny.us/reporter/Decisions.htm
New York Slip Opinions
http://iapps.courts.state.ny.us/lawReporting/Search
Google Scholar (Select "Case law" and then "select courts")
https://scholar.google.com
New York Research Guides
Legislative History Tutorial (NYS Library)
http://www.nysl.nysed.gov/leghist/
Library of Congress
https://www.loc.gov/law/help/guide/states/us-ny.php