Ill reccomend a few bands from each genre to get you started. if you find you like a certain genre let me know and ill give u more bands.
Black Metal: Emperor, Immortal, Venom, (venom isnt really black metal, they had an album called black metal that sorta gave the genre a name, but its a much different sound), Mithotyn (this is sorta black/folk metal), and Borknagar
Death: Atheist, Death, Arsis, Ribspreader, and Dismember
Melodic Death: In Flames, Dark Tranquillity, Soilwork, At The Gates, and Disarmonia Mundi
Thrash: Testament, Death Angel, Exhorder, Kreator, and Metallica (only the first 4 albums)
Progressive: Evergrey, Nightwish, Into Eternity (prog/death), Deream Theater, Odyssey (dan swano project)
Power Metal: Blind Guardian, Iced Earth, Angel Dust, Helloween, Edguy
that should be enough to get you started. let me know what you like, and ill reccomend more.