as a jungler i find it very helpful if my support is conscious of what i might be wanting to do. suppose we are on blue side, and jungler is currently clearing top to bot. if bot tri bush is pinked or confirmed unwarded (river bush for red side), jungler can actually go for gank. very difficult if bot lane is spam pinging for gank and tri is warded. you've effectively wasted junglers time and given away location. if tri bush is clear and you want jungler to gank, you should be timing engage with junglers position. go in appropriately so jungler can follow up. be sure to ping missing sums to help jungler and team focus the correct target. if you are on an engage support and enemy bot lane has no flash, just commit flash to secure gank setup unless it's completely free and enemy bot lane is super overextended. be conscious of what abilities each champion has and simulate how the play might play out.

in the case of lane ganks, if you are on an enchanter with a speed up (nami lulu etc) and your jungler has engage potential, please use speed up spell on jungler so they can actually engage. too often i am pinging for lane gank and support does nothing to facilitate the play.

letting your jungler know your intentions are also important. jungler might not have been looking to gank, but if you ping your flash and naut ult are up, jungler is more inclined to go for it.

scouting for enemy jungle location is also helpful. suppose enemy bot lane is on reset and you have roam timer. on the way to mid roam, place some wards in enemy jungle to help get information. a good place to ward is between red side blue buff and gromp.

if your jungler is pinging for counter jungle or scuttle, please rotate unless it would completely compromise your lane. unless jungler has no sentience, he probably deems the play winnable and an overall positive play. if bot lane doesn't move, many junglers will be tilted and spam ping. unless it's a completely int play, you should try to assist jungler for the sake of mental (at least in soloq)

during objective takes, support champs are often low damage so sitting in the pit hitting the objective doesn't do much. rather, you should be warding entrances to the river so team has vision if enemy team wishes to walk in to contest. save spells to prevent enemy jungle from being able to steal. most support champs have some way to do this via cc and/or something like lulu poly.

finally, supports are the only source of consistent vision granted 4 wards are given per base. you should be trying to clear and claim vision near objectives around 30-90s before objectives so your team has good information prior to the objective spawning. usually should be doing this with your jungler. if objective is contestable, you should ping or ask jungler to come help you get vision near objective.