Could anyone explain me what these are exactly? I tried searching these things for a definition and an explanation of what they are but I could not find anything. I know metadata is important but I don't know exactly what it is and what it is for. Same for NMS and NBT. They sound like they are important cause people mention them but I never stoped to think what they are. Sorry if this question looks so stupid but it's the first time I get into these things.