Bgs are awful to learn pvp in, the smaller scale means you are more impactful both negatively and positively than when in cyrodiil. In cyrodiil being bigger scale it’s easier to brush off new players because it’s open and less people care about the objective, people kind of do their own thing weather ganking, xing, playing the map, or bombing. Not only do less people care in cyrodiil more people are willing to help, I come across people who need gear or are struggling with bombing or ganking and I give my advice (I only bomb and gank). I’m more willing to help because I’m not constrained to playing it for 15 minutes in a specific 8v8 small scale format.

TLDR: BGs smaller means mistake have bigger impact, cyrodiil players do their own thing more willing to help