Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
You always start jungling with bot lane pull.
Make sure to reset your aa's with your Q.
You farm the three camps on the side you started jungling and go back to get the 1039.png (to get more xp).
Now you want to level up to lvl 6. (If there is a good gank possibility then gank)
Once you hit lvl 6 you get full ferocity stacks and you gank. If mid/top/bot has some cc and your laner isn't pushing to hard, press R and jump on the enemy while using E ferocity to root the enemy.
If your laner is low after the gank, push the lane with him. Ignore agressiv pings.
After ganking don't waste time and farm more until your ult is up again.
Something general: -Don't waste your time!!!! (for example sitting in the bush or waiting for 50 gold in the shop).
-When your mates push lanes hard you can already expect a gank of the enemy jungler so stay near and countergank with your ult.
How to oneshot kids:
First of all, make sure you have full ferocity.
Then press Ult rengarR.png and run to your Victim. When you are near him press ferocity Q rengarQ.png. Just when the jump started you press ErengarE.png, WrengarW.png and Hydra3074.png at the same time (it is easier with smartcast).
Don't forget: You won't be able to hit the combo perfect at the first time (it took me a lot normal games but with enough practice you will oneshot people earlier than you think).
You can see the combo here in slowmo at 1:40
My Rengar Oneshot Montage:
Always remember: Learning a champion is always hard so don't give up early. I recommend practicing Rengar in normals. When I learned Rengar I lost a lot of games but now I am Diamond Rengar main.
If you have questions left then add me on EUW: DrBaenki or comment this or comment my rengar video.
Have fun and don't destroy the kids tooooo hard. They shouldn't uninstall right after the game against you.