5 Things Everyone Should Know About Wards (courtesy of a support main)

1) Riot made a change several patches ago that gives full gold to both the player who reveals a ward and the player who destroys it. This means that if one player finds an enemy ward by placing a control ward or sweeping, it is better for a teammate to deliver the killing blow so they both receive gold.

2) If you see a teammate using their Oracle sweeper, travel with them, as this serves two purposes. First, they won't be picked off for being alone while clearing wards. Secondly, a single person clearing a ward is limited by their attack speed (and for supports this is incredibly slow); by pairing up with them, you will clear wards faster as a unit, cover more ground, and potentially deny more vision.

3) This is a tip primarily for junglers and roamers. If you see someone place a control ward and it reveals a ward which did not see you before being disabled, do not attack the ward. Attacking the ward will reveal you to the enemy team regardless of its disabled status, so by letting the placer of the control ward clear it you remain undiscovered. ([visual aid created by u/iamPause](http://imgur.com/a/NMQWA))

edit: 3.5) When you're in baron pit and you're starting baron, don't destroy the ward or the enemy team will notice you are there. Leaving the ward denies vision, whereas if you kill it that's a few seconds your enemies are granted a window into the pit. Wait until after the objective is secured before attacking the wards unless you are worried about teleport. (credit to u/Noctis_ff_at_15 & u/Taylor1350)

4) You can ward the tribrush in botlane from the dragon pit. This is known as the Scarra ward because if you place it incorrectly, then the ward will jump to either side of the brush instead of inside of it (which Scarra did twice edit: make that three times in a matter of seconds on stream). To place this ward without fail, look for a snail on the wall of dragon pit above the tribrush. Place the ward directly on the snail's neck, and your ward will go into the tribrush every time. Sidenote: You can also place a ward in toplane tribrush from baron pit in a similar manner, though personally I don't know the marker.

5) Think of control wards as outposts. If left alone, they can be easily dispatched of, but if your team remains in their vicinity it claims that territory, expands your control further towards the enemy, and carries the opportunity to punish opponents for invading that space.

- = Bonus Tips = -

Bonus tip) If you plan on switching from a vision trinket to a sweeping trinket, try to time your back such that you can place one more trinket ward before switching. In this way, you still gain utility from your trinket slot even while it is on cooldown from switching types and you don't waste the time it has spent cooling down from your last use.

Bonus tip #2) On the same token, if you're about to recall with Sightstone wards left and you don't have any decent wards out, pop them down somewhere close before you recall. (credit to u/apexjnr)

Bonus tip #3) You can place trinket all ordinary wards while recalling without cancelling the recall channel; this does not extend to control wards afaik. (credit to u/Taylor1350, u/Malthax, & u/KissMaPaws)

edit #I lost count: After many edits, it seems this has grown into 5 10 Things Everyone Should Know About Wards. I am in favor of this development; the more teams know about wards the easier it is to play the game itself. Be sure to check the comments; there is even more great advice I haven't added to the OP that can step your ward game up even further. Some posts go very in depth which is why it would be cumbersome to add them to this post, but they would greatly benefit anyone who hasn't seen the information detailed therein previously so I implore you to explore further.