These links provide information about candidates and measures.
Aside from the presidential election, you may have many other races on your ballot.
All US Representatives are up for election this year. To find your US representative, you'll need to look up your district.
All New York state senators and assembly members are up for election every two years -- which means all the seats in the state legislature are up in 2020! Here, too, you'll need to look up your district first.
All other elections, such as city council members, judgeships, school boards, etc., are considered local. Your city or county government can provide more information about these.