Who am I
I'm Platinum support main (started from SS6 - NOW) in Thai sever this is my second guide please liked my facebook pagehttps:https://www.facebook.com/Support-Guide-1138791109619091/ for easy to see my guide xD

1.you are good in team fight stay in back line dont stand like Braum.
2.Don't leave from your ADC until you and your ADC LV.6(Have Ultimate) that's you can roam
3.Make sure your team have good vision in mini map
4.If you want to roam make sure you can make kill or assist to that lane(don't feed in that lane)
5.It's a good thing if your ADC is your "DUO"

(Support guide is similar with Braum)

Pros
-Have sustain for every one in team
-Have CC
-Useful shield( +AD)(+Ardent censer)
-High movement speed/color]

Cons
-Very very squishy
-Use your hand speed for protect your adc from fast animation skill(same with Braum)
-Can do nothing with out ADC
-If use Zephyr(W) she will have slow movement speed because Zephyr(W)passive

Passive:
Tailwind
INNATE: Janna passively gains 8% bonus Movement speed movement speed and grants the same amount to nearby allied champions moving towards her.

Q:
HowlingHowling Gale
Janna summons a whirlwind at her current location which charges up over 3 seconds. Its range, speed, damage, and Airborne knockup duration increase for each second it is left charging.

W:
Zephyr
PASSIVE: While Zephyr is not on cooldown, Janna is aided by an air elemental who ghosts her and grants her bonus movement speed.
ACTIVE: Janna commands her air elemental to attack the target enemy, dealing them magic damage and Slow them for 2 seconds by an amount, capped at a maximum of 99%.

E:
Eye of the Storm
Janna Hybrid resistances shields the target allied champion or herself for 5 seconds, decaying over the duration after 0.75 seconds
While the shield holds, her target gains bonus attack damage.

R:
Monsoon
Janna Channeling channels for 3 seconds, Airborne knocking back all nearby enemies up to 875 units based on their proximity to her, while Stun them for 0.5 seconds.

While channeling, she releases soothing winds that Heal power heal nearby allies every half-second. Moving ends its effects immediately.
Credit:http://leagueoflegends.wikia.com/wiki/Janna

Flash: Always choose it
Exhaust: when you face assasin in team fight such as Zed,Talon
Ignite: if you fight with sustain enemy or think exhaust is useless
Heal: when your ADC choose Barrier

(Same every support)

W-For movement speed + rune CELERITY + Shoes + Passive
E-Shield for protect your allies
R-Qne of the best skill in team fight
Q-Hard to use

Janna good to come with ADC that's have too much atack speed such as VarusVarus + guinsoo rage bladeguinsoo rage blade+ Berserker's Greavesberserker's greaves+ Ardent Censerardent censer+ Eye Of The StormEye of the Storm

See the pictureI usually ward 1 2 5 in early game (Lv.8+ I prefere to ward blue enemy side )
Credit: https://blog.gamersensei.com/article/warding-101-guide-bot-lane-league/

You too weak in early game just farming and protect ADC

Use your brain for think about your ultimate Monsoonfor protect your ADC from assasin such as Talontalon, Zedzed

My guide have something difference from old janna guide however I thankyou for every one for reading my guide and don't forget to like my page Support Guide:https://www.facebook.com/Support-Guide-1138791109619091/