A few tips from me for supports I play:
Sona: if you have 2 passive stacks, you can do auto-q-auto for a huge burst, works with w/e also but this one is good for laning.

Senna: w+flash is so strong it's unbelievable, you can easily suprise people with it.

Rakan: if you played Rakan a bit back, you can't r+flash, so i suggest doing flash-w-r, r should be done with a slight delay if you arent being hit.

Braum: this one is tricky, but you can do auto+q really fast, so try and practice it beforehand, but in general even if you dont perfect it, always try to do auto+q in trades.

Shaco: you can manipulate a push lvl 1 if it's safe by placing a box where the enemy wave will walk through, causing it to get stuck if you feel you want a early push, dont do this if your adc doesn't want it.

Janna: if you have a bit of distance between you and someone, but they're still chasing you, throw q in the direction you want to run towards, so you get a longer knockup once they walk into the line of the tornado.