I myself don't know many but in this guide there is a very detailed section about pathing combos and jungle calculations.
I could also lead you to this guide. It maybe doesn't talk about Rengar but the tracking section is super big brain and useful for all champions.
You can also check out my guide as well. Scroll down into Jungle flowers section where I explained some hidden tricks you can do with jungle plants and some less orthodox usage of them.
Gaht, how does it happen that no matter what I say I always end up promoting my own guide XDD
I could also lead you to this guide. It maybe doesn't talk about Rengar but the tracking section is super big brain and useful for all champions.
You can also check out my guide as well. Scroll down into Jungle flowers section where I explained some hidden tricks you can do with jungle plants and some less orthodox usage of them.
Gaht, how does it happen that no matter what I say I always end up promoting my own guide XDD