Noob Question: What's it mean by 1 Raid Reset

As in you can do 1: 10m or 25m Naxx, 10m or 25m OS, 10m or 25m EoE? Or is it referring to ToC when you could do 10m Normal 10m Heroic 25m Normal and 25m Heroic in one reset.

I know its a dumb probably a dumb question, just so much of this works differently on each pserver

You can do all and any 10 and 25 mans you want, the only things that mutually lock each other out are the normal and heroic versions of ToC, ICC, and RS

Trial of the Grand Crusader 10 and 25 have their own lockouts. Only Icecrown Citadel and Ruby Sanctum share lockouts between normal and heroic