So since I last played DM as a kid, it seems like a million things have happened and I'm having a hard time figuring out what actually applies to the TCG and what is exclusive to the OCG, I'm currently browsing the wiki, but all these concepts of Castle, Fortress, Gacharange, Aura, Hyperspatial zone, ect... I'm getting dizzy just trying to make heads and tails of it, it's nothing like the game I remember all of a sudden.
so, how much of this stuff is actually used when playing the TCG? I just downloaded OCTGN and is setting it up and I'm kinda worried I might be getting in way over my head on this without some guidance to what I need to focus on. What specific rule set do this community consider to be the frame of the TCG game that I can rely on? without getting too caught up in OCG specific stuff.