Early just stick to farming , when you reach lvl 3 just take water element and wait for the W cd to be ready , EQ aa W the wall keep aa when they around 200hp Q with ignite 80-90% you will always get them , basically that's the best early combo you can do

So you went back you got your swords or the 1st item , now you need to add the ult to the combo , the way to do it is same as early so basically w water , wait for cd , wait for them to be close to a wall (you need to know how far your ult push them) , EQR them to the wall W the wall u ulted them to , aa and Q , almost always they are dead

So now your goal in teamfights is to either catch their carries and 1shot them or do a team ult , keep your eyes open and always have your water element on you

So you need to know wheres the jungler at before going all in on your midlaner , that's in early , in mid game you can double them by double ulting them to the wall killing the mid and continue on the jungler and yes always ward , you can also outplay them with double water element = double root , or grass element but for grass to be effective you need 40% cd , at 40 the W cd is 4.2 and the stealth rotation is 3.5(without attacking) if you attack you won't be able to go back to stealth

You can start roaming to top and their jungle before 6 , to bot preferred after 6 and yes same thing water element is the key