PSA to people about to play Janna
Max her W first rather than her E for easy harass. Her E is for emergency shielding or tiny trades, and the amount of damage you can do with a max level W is insane for its short cooldown.
Also, stop using Q to harass. It's good for keeping away surprise ganks.
Reminder that your E will increase the AD of your ADC, but will decay over time, so use it when either your ADC needs the damage reduction, OR the attack steroid, and don't waste it willy nilly.
Your W has a slow.
You can Flash R to seperate an entire team, then use Q horizontally to keep the entire rest of the enemy team at bay while your team deletes the 1 or 2 people that flew towards your ADC.
For the love of god don't max E first it's not good anymore after the shield decays.