A good way to harass is to charge up your tornado, make sure there are 2 enemy minions near the person you're laning against, ocassionally you can dash through one of the minions, dash onto the enmy champion and knock them up with the Tornado, and dash back out through the other minion.

If you are laning against ranged champions, you can use your wind wall to deny their cannon minion, or deny alot if they are under tower, if they decide to come through the wind wall and cs, poke them with your Q.

During All-Ins, when you knock the target(s) up, auto attack him once and then ult, if you're taking fervor, it will give you more stacks and can help secure the kill.

If you get ganked from an unexpected position, if you're level 6 and their jungler has very little items, theres a 50/50 chance that if you get a double knockup and ult them, you can win the fight if you play correctly, use your windwall if its something as annoying as a nidalee spear or Sejuani ult.

This is one of the best abilities in the game in my opinion, it can completely negate **** like Global Ults, Lee Sin Qs during ganks. During team fights, always keep the enemies that have strong CC in mind and get ready to windfall.

Getting Multi-knockups during team fights are really good, but that doesn't mean that you should hold on to your ult until you get a 5 man knockup, if you feel that the fight will be long, you can just ult if you get a 2 man or 3 man knockup, the ult cooldown is shorter than you think. If the ADC tries do something or do damage, wind wall him, it will waste some of his time and increase your team's chances of winning the fight.