Check the recommendation thread at the top of the page. It answers all of these questions and more.
Too many genres to tell you the differences between ALL of them in a few posts. You'll eventually pick up the differences between genres the more you delve into metal and branch out. Also, do as broadsword suggested.
i like thrash metal the best... there is a forum or a thread about that.. search
Quote by Moggan13
Serjem is like a Bishops testicals: Swollen
IIIIfb * KARKOLI * ytIIII(mostly rock... a little funky, a little hard just the way you want it )
ye ol' searchbar

Epiphone Les Paul Standard Plus-Top, SH-2 and SH-5
Ibanez GRX20
Baron Acoustic
Peavey Valveking 112
Roland Cube 15
Dunlop Crybaby From Hell
Dunlop GCB-95 Crybaby
Boss MT-2 Metal Zone
Boss PH-3 Phase Shifter
Boss BF-3 Flanger