I didnt know avherald but what a great resource. Also, a bit scary that it seems to be daily accidents/incidents...
They actually answer that in their FAQ[0], third question.
Was also trying to figure out what R meant.
I find it sort of comforting - there are minor incidents (rejected take-off, go-around, engine problems, fumes, cabin pressure, gear problem, ...) every single day, but almost all are resolved without loss of life.
And, in all my flying, I've never even experienced one of those minor things (except an air return on the way to Yap). So, things are really pretty safe.