It's a long thread, but I had the same question when I started the thread on Marlin Motion Related Configuration.h Settings for MakerFarm i3v. The scope of the thread goes way beyond the jerk settings, but you can use the table of contents links in the first post to narrow how much of the thread you look at. I do come up with my own conclusions, but more importantly, the thread provides some gcode snippets that you can use on your printer to experiment with. That's the best way to learn what the settings are all about and what seems to work the best for you.

EDIT: and I'm sure 99% of the lurkers out there are rolling their eyes at me pushing that thread on someone. Again.

EDIT #2: What I concluded in working that thread is that if someone had the miracle answers, they were keeping them to themselves. So, I was left with trying to figure out what the settings were and experimenting with them.