Newb trying to understand mastering and pressing

I’ll be buying a turn table once I get my income tax return and was looking around at vinyl. Might pick up a copy of Cowboy Bebop, given I get the feeling it was kinda meant for this kinda media, but maybe that’s just me.
Otherwise, I stumbled across a couple copies of Dark Side of the Moon, both denoting to be Winchester pressings, though one is mastered by Wally Traugott while the other is by Ken Perry. Also, I found a copy of Van Halen 1984 with the Quiex II sticker. Can anyone explain the significance of these kinda things, and why something may be more or less desirable?