ok so i'm 13 been listening to metal for almost 2 years and i'm f**kin tired of all the posers i mean they consider themself hardcore because they listen to slipknot,avenged sevenfold,atreyu,korn,linkin park or any shitty nu metal or metalcore band and they don't know anything about anything about metal they consider slipknot death metal? marlyn manson black metal? come on and they always insult death metal i mean i dont listen to death metal but i dont diss death it takes alot of talent. is it just me or are posers ruining metal for us real die hard metalheads?
i don't think nwobhm is a genre, more like a cultural phenomenon or regional scene. the name is self-explanatory: it's heavy metal, but newer and british. as for your other question, i'm not sure i've ever heard of dark metal, unless you mean black metal, of which there are many differences between it and death metal.
The new wave of british heavy metal was not a genre, but rather an era/movement of sorts of metal in Britain in the late 70s that later become known internationally. Its kind of when metal made a transition to a heavier sound, changing from stuff like Deep Purple and Black Sabbath into Iron Maiden and Motorhead, etc. The metal sound became heavier and faster in many cases. If by dark metal you mean black metal I can explain the difference: Black Metal is a genre of metal known for speed, shrieking vocals, and heaviness that is sort of a combination of speed and thrash metal and some elements of hardcore punk. It includes bands such as Celtic Frost, Mayhem, Venom, etc. Many of the bands are from the area around Norway, Sweden, Finland, etc. Also, a large part of black metal themes are anti-Christian or express discontent with human existence. Death Metal is a genre of metal similar to black metal, but contains more of a growled vocal component. It is branched from thrash metal, and elements of early black metal (80s). Examples of death metal bands would be Morbid Angel and Cannibal Corpse. Also, death metal has many subgenres where as black metal is less diverse or large a movement.
The NWOBHM was a movement, not a genre. Death metal and dark metal are unrelated. Dark metal, at least in my experience, usually refers to either a metal/dark ambient fusion, or metal with a very dark feel that isn't doom, death or black metal.
It's been a while since I've heard good Metal come from Brittan. Links would be appreciated Death Metal is intense Metal with death growl and blast beat drumming Dark Metal is basically a cross between Black and Gothic Metal. Most of the Dark Metal bands I know of are German with Eisregen as my favorite.
NWOBHM isn't a genre, it's a movement. It's when several British metal bands gained prominence and recognition There is no such genre as dark metal.