You need to gank lanes and counterjungle to prevent shits like hecarim to run wild or yisus. Take blue/red/green(vision) smite (all 3 are k).
The combo should be
EQ-Rhydra-Smite-W (buffer so it fires on the ground) aa.
Casual combo.
EQE is for the reset, throw in hydra/smite if needed.
Max q and evolve it first, after level 6, to gank lane, ult into it so they can't see you. Save e after they flash.
Ganking bot: Focus the squishier champ. Make sure they aren't in position to fight back
Do not attempt to dive if you don't have volved E, fed, or you can't tank the tower.
Don't gank lanes when your laners push and they have no hard cc.
Pick kha'zix into wombo combos so you can clean up a fight.
Good luck.