Hi, in this guide you can check out a current meta build for rengar and how to perform the combos correctly

You wanna always start krugs, Rengar is very squishy in the beggining and he has an extremely hard time in the jungle. Doesnt matter what side, start the krugs. Ask for a heavu leash and try to get 3 ferocity stacks. After krugs, do the raptors. Kill the small ones first and try to auto the big one when you have the krugs passive. Then do Red. Save your smite for the execute. If on the red side, try to look for a bot or mid gank, if on the red side, look for a top or mid gank. If you cant, Go kill the other side of the jungle, try to start blue for the extra cdr then do gromp and wolves. Back And purchase your first items.

Warrior is very good as it gives you that cdr plus the damage, after that you get the hydra so you have more burst. Last whisper will give you the armor pen for the one shots and yoummus ghost blade will allow you to get to your target faster when in your ult.

Rengar ganks aren't very effective until lvl 6, when you can come in unnoticed and burst people down. There are two things you can do. Always gank with 5 ferocity stacks. FIrst, click your r k and go in. Befoe you jump onto your target, decide if you want to take the kill quickly, or you want to secure it. If its the first option, jump onto your oponent i¡with your passive, use your empowered q, the hydra and then your e & w. If they are not dead, they will be slowed, which will allow you to hit them with a normal q and finish them off. If you want to let your laner keep the kill, you should leap onto them and use your empowered e in mid air, so they have no time to react. Then, let your laner unleash a combo on them or just attack. when you do this, make sure the enemy is low enough for your teammate to kill him.

When you team-fight you have one goal. You HAVE to eliminate the enemy carry. For this. jump onto the back-line with your ult and use your Q<hydra<w<e combo to kill them. It doesnt matter if you die immediately afterwards, you will have served your purpose.