Hey all, been lurking around here for a while now. As I said in a comment, I was a big Braves fan growing up and admittedly lapsed after Chipper retired with a new career, family, etc. But this year I am really digging back into the team, and while I would consider myself smarter than the average baseball fan (I am not 100 years old), I still feel like I'm a little behind the times. For the past few years in baseball arguments, I've been using WAR as the go-to metric for measuring players against one another (I had many a Mike Trout vs. Miguel Cabrera MVP arguments a while back), but it seems like now even that has gone by the wayside. From lurking around here and combing through Braves Twitter, it seems the primary metrics people are using to measure players/prospects are:

Hitters: wRC+, OPS+

Pitchers: FIP, xFIP, K rate, BB rate

For hitters, I know those two are based on a scale of league average being 100, so I can judge those fairly simply. But for pitchers, I'm not sure how to measure FIP, xFIP against the traditional ERA stat, or what really constitutes a strong K rate or BB rate.

Just curious if you guys have any tips on how to use those metrics for analysis, or any other suggestions for metrics to look at.