PSA: Control wards only reveal camouflaged champions
I was spectating a game yesterday where it was pretty obvious no one knew how control wards work.
Teemo kills the top laner and is at pretty low health. Enemy Syndra comes up. He can't make it to tower, but he can make it to the brush, and Syndra won't even know what brush he's in. So he runs for the brush.
Syndra comes up, and guesses the correct brush. She uses QWEQ, and Teemo dodges all four like a boss, meaning she doesn't get a shimmer to know he's there. Then she places a control ward. I don't even have time to think "that won't reveal Teemo, he's Invisible" before Teemo flashes and tries to run to tower.
I can sort of accept Syndra not knowing, but this stuff has been out for way too long for a Teemo main to not know that yet...
PSA: Control wards only reveal camouflaged champions, not invisible ones! That means Evelynn, Rengar, and Twitch are revealed, and nobody else.
To find an invisible unit's location: Red trinket will flash their location, you can make them shimmer by hitting them with a skillshot, in addition to champion/item specific abilities such as Rek'Sai's tremor sense. You still will not be able to autoattack or cast targeted spells at invisible champions.