I think "concentration" is too strong a word, even, since samatha is really about letting go (of objects other than the object of meditation), rather than buckl

I think "concentration" is too strong a word, even, since samatha is really about letting go (of objects other than the object of meditation), rather than buckling down and trying to focus, which I think a lot of people associate "concentrating" with. For me phrases like "gently staying with" or "quietly attending to" or even "remembering" (which is sort of what sati means anyway) work better than "concentration", but it seems like there isn't a perfect piece of terminology to describe the kind of effort/effortlessness balance that has to be achieved for samatha to work. But I feel that "letting go of distractions" is a better way around it than "concentrating one-pointedly" which tends to sound very effortful. Mindfulness/vipassana/insight, I have no idea what a good phrase is. There are so many modifications of insight techniques that it's hard to find a common core sometimes. That said, I believe the early Buddhist texts (i.e. the suttas) don't really make the samatha/vipassana distinction much if at all, this is a (relatively) recent development. And it seems like practicing one necessarily invokes some of the other (apart from during very refined states of samatha where there's no "bandwidth" for the kind of analysis and noting that happens in most insight techniques). I've often thought of vipassana practice as "applying the principles/mechanics of samatha to (xyz mental noting technique)", which might be why some traditions tend to have you do some form of samatha first before vipassana - because the mind needs a little training in being steady and dropping distractions before it can apply a vipassana technique in a (roughly) one-pointed way.