For the perfect long range cc chain E from max range then instantly R, use W mid air then AA Q AA after you land.
To cc two people at once R your primary target then instantly F Q W your secondary target, then E back towards your primary target.
To perfectly cc chain from melee range Q and instantly eAA W AA then instantly E R and AA again.
An alternative quick engage is to R on your target then instantly Flash E. Use W mid air then AA Q after you land.
To surprise engage from outside range, E on your target then instantly Flash. W Q mid air. Use your R right after you AA for your stun.
For a nice cc chain from range E then mid air W and instantly Q when you land. Follow up by quickly using your R and AAing.
If you're already in melee range full trade on your target with W Q instantly, then quickly cast R. AA twice and then E AA immediately.
When trying to all in at level 6 R then E once the stun lands, W mid air then AA Q instantly once you arrive.
Take out a freshly placed enemy ward on your own by using AA then a quick Q AA.
Your standard level 2 all in is to E then instantly AA Q when you land.