As a Poppy main, I will give you some of my tips when playing her (: if you have any questions ask me. (:
First I'm going to go through some build orders, item strengths and anything item related:
First off, 
is a must have on Poppy, nice passive, good stats, just amazing with her kit.
Average Game Build 
I feel like this build is the strongest for Poppy. You deal tons of damage, while you take in tons of damage. Poppy is the strongest engager and disengager in the games, so you gotta be equipped with items that can be used for both. deals AoE damage around Poppy to give Poppy more burn with her engages. Also not to mention the health and armor you get. is another great item for engaging and disengaging by slowing down the enemies engager, or when you are focusing a carry, prevent their escape with the huge slow active. and are for packing more punches(or hammers) toward the enemies. When engaging, the enemies may be trying to hurt you but not with these two items as the shield bonuses are insane. Maw can also give substain when you need it the most, and gives a AD boost, while Sterkak gives a huge shield boost and attack damage boost when low. Overall this is probably the strongest Poppy build you will get facing a normal 5v5 game.
Situational Items
- Warmongs is for the little extra substain you need. If you are winning the game, feel free to buy Warmongs so you can engage, ace the team, regenerate your health back, and go for a Baron. If you buy Warmongs replace it with
- This is for those sneaky assassins that burst you down really quickly. If you do purchase Banshees keep aware you can engage fights even better as you may W, E in without any disruptions. If you buy Banshees, replace it with or
- If you find yourself not the best engager don't worry! This item will even make your engages even stronger than before! Combine this item with your W you will find yourself E'ing toward the enemies carries in no time. If you do buy this item replace it with
- I just added this item, I just tried it and it gives sustain, huge AD steriod, similar to Warmongs, replace it with Sunfire
If there is any other items you are wondering about please let me know (:
**Masteries:
**
0-12-18 Keystone: Grasp of the Undying
This keystone is the best for Poppy as Dead Man's Plate combine with her Passive can be destroying your opponent, you will normally be up in their faces.
**Phases of the Game:
**
Laning Phase- In early game level 1, both you and your rival will just be farming and poking. If your rival is melee, take advantage of them when they try to farm. When they go in for the creep, Q them, auto them with the keystone mastery bonus, and they should have about 300 health missing from their health bar (Don't do this level 1 trick on range champions it won't work.) Rinse and repeat. Once you are level 2 you want to start getting in the enemies face. Before you do start going in, check make sure not many minions are around, then try to bait them onto terrain, E, Q, Autoes and you should be getting them low. Rinse and repeat. Sooner than you know it, you are level 6. When dueling against your rival, be sure if you E, you can land your stun. So just press ult on them (Don't hold onto it) position yourself for your E combo, then you should most likely win the duel!
If Gank before level 6- Poppy can escape ganks easily. When the jungler ganks you should be at least level 3 to have all abilities. If their jungler does not have a dash, use W right away (ex: WW, Trundle) but if the jungler does have flash (Lee Sin) save your W for his W or his second Q. If you are trapped between your top laner and jungler, E the person closer to your turret, Q, then W. You will get the hang out of it
Gank if you are over 6- You have huge outplay potentional, but you have to decide if you can 1v1 the jungler or the top laner. If you cannot simply ult one of them away then continue on with your lane. Be sure to know your power before you do attempt to do something.
(I skipped every other phase but tell me if you need another phase)
Teamfights- teamfighting can be simple. You can disengage with your E and W and even ult. or even engage with those moves.
Engage- If you are engaging, first charge up your ult, aim toward the tanks and peelers. if done correctly, you can go charge in toward their carry with W E Q and they should most likely be dead as your team follows up
Disengage- If someone like Lee sin comes in just W and E if towards your team, but if someone like Malphite comes in, just ult him just to be safe.
I know this isn't a lot because I spent a lot of time writing this, but if you have any questions please ask!
