Pros
Can burst easily.
Q can literally melt an enemy. (High damage poke)
W R can burst whole enemy team.
Low cooldown and mana cost.
AP that hit hard.
Excellent in every stages of game.

Cons
Can be Easily burst.
No Crowd Control
Hard to Master
Everything is a skillshot.
Risky Playstyle.

Quint and Mark: Magic penetration flat for melting the enemy team.
Glyph: Magic resist flat for early protection in lane.
Seal: Scaling armor lat for late game.

As long as you get Thunderlord, everything is fine.

Early needs Decent mana regeneration so going doran's ring is a good choice since you'll be last hitting using your Q.

Boots can be either Cooldown or Magic Pen. If your jungler always give you Blue, get Magic Pen.

Lich and Tooth are your main source of your Q damage. As well as your AP and CDR.

Abba Cap and Staff are good late game items so make sure to get em.

Need protection? Get Zhonya.
Need more Burst? Get Echo.

Flash is needed no matter what.

Teleport is for lane sustain and gank.

Ignite if going aggressive in lane

Heal for saving you and a life.

Barrier against burst.

Cleanse for Escape.

Ghost is not recommended.
Same goes to Exhaust and Smite.

Passive: Will take advantage of Tooth's passive to still keep dealing a lot of damage in hitting.

Q will be used for Last hitting | Poking. will done a lot of damage from Lich and Tooth.

W is good for team fight.

E for escape and securing kills kills

R is also good for team fight.

Everything is focused

Defending Tower
1. When your enemy approaches tower, move to wraiths and get as close to the wall nearest to your turret you are trying to defend.
2. Wait for them to stop moving and start auto-attacking your turret.
3. Aim your Trueshot Barrage at the enemy mid laner and fire.
4. Immediately follow up with a quick Arcane Shift (if the distance is not enough, use flash first) + Essence Flux + Mystic Shot.

Laning
1. Last hit using Q.
2. Poke enemy with Q if it is missed positioned. If E can hit the enemy, Use E and W to pop Thunderlord.

Team Fights
1. Stay behind your team or flank on the side. You are slippery enough if they follow you after you flank.
2. Always timing your R. Hesitate to use if possible.
3. Do not forget to land all your skillshots before you die.

Loaf will be quitting the game for a while so i save here how i played my Ezreal.