This is my first guide so please dont be all hate on me and like ooohhh what a noob bla bla bla. So give me tips on how to improve my guide instead of giving me hate. So please read and enjoy :D .

"Q" Skill is good for farming.
His Ultimate ("R" Skill) is very good to get foes who are getting away with like 5 hp.
Good help in a teamfight.
Can heal himself.
He is a f*ckn pirate :DDD .
He is good in every part of the game (Early-, Mid-, Late-game).
Has a good first blood potential.
Is a good ganker.

A bit squishy at the start. (no major issue)
Has not got much mana at start.
Has not got very awesome skins (if you are that kind of person who is out for the coolest skins).
Has got over average CD (CD is cool down).
Gangplank is not a jungle character.

[*]GREATER MARK OF DESOLATION: Armorpen (pen = penetration) is key for his "Q" skill doing damage.
[*]GREATER SEAL OF MALICE: Crit Chance is great for Gangplank! NEVER FORGET THAT!
[*]GREATER GLYPH OF MALICE: See above.
[*]GREATER QUINTESSENCE OF Desolation: Armor pen is reeaaaaly good.

[*]Parrley: This is your bread and butter. every time you kill a unit you get extra gold! It also works great with crit and it deals physical damage.
[*]Remove Scurvy: This skill will heal you for an amount and it even cleanses him, i mean, how much cooler can it get ?
[*]Raise Moral: This skill gives you as a passive increased movement speed and attack speed. When its activated you get even more movement speed and attack damage and all your allies in a radius will get half as much ! (When you activate it the passive is lost until you would be able to use it again !)
[*]Cannon Barrage:THIS IS BEAST! You can aim this anywhere on the map in a circle and cannon balls will fall on random positions. Every enemy in the circle will get even slowed !
FOR ACCURATE INFORMATION LOOK AT THE SKILL AT THE TOP OF THE SCREEN!!!!

You dont have to follow this item build but its how i would play Gangplank. Now i could write a reason for why i would take the items i get, but instead i am just gonna write i got these items for these reasons:

Crit chance
Attack damage
Attack speed
CD

GOOD CHOICES:
[*]Ghost: My personal favourite choice for Gangplank because he is a melee fighter.
[*]Exhaust:Because he is melee and in combination with ghost it is just awesome!
[*]Flash:Always a good choice for every hero!
[*]Ignite:Always good way to finish off foes but for that zou have your ultimate.
[*]Teleport:Also good i guess....

[*]Parrrley:Rank this up first (of course without counting your ultimate) because it is your main damage skill and also your only damage skill if you dont count your ultimate! Also this skill is in perfect harmony with your crit for insane damage !!!
[*]Remove Scurvy:Rank this up second because of its amazing heal in mid- until late-game! Also because of its cleanse which will help in early ganks against you which is extremley usefull!
[*]Raise Moral:Rank this up 3rd with one point in it at level 4 because you only need it for its passive and for chasing its active.
[*]Cannon Barrage:Rank this up obviously because its his ultimate and kills foes really good. And i dont know if i offend some people now but every player who doesnt rank up his ultimate as soon as he can is a NOOB in my opinion (no offence guys) .

[*] Early-game(1-8):
You should be pared with someone who has good cc. Try to last hit with your "Q" and when you think that your opponents overextend use your skills on them (iniate with your "Q" and then use your "E" and melee them). never attack them behind their creeps or you will most likely die. never be aggressive (except if the opponent is awfully low of course) and try to stay in the bushed until they overextend to ambush them. That should most likely get you first blood.
[*] Mid-game(8-14):
Now you should have at least one kill and your "R". Always when foes are attacking a tower of yours use it to scare them off. Of course if an foe is awfully low and you want to snipe them with it its also a liable choice, just dont kill steal because thats just for noobs. your "Q" should be raping them and everyone should be scared of you and focus you. REMEMBER:In a team fight it is not your role to initiate. Just stay back and as soon as it starts use your "R" and your "E" to help your team pick out the squishys with your "Q" and kill them.
[*] Late-game: Now you should be far ahead against your foes it should be gg for them.

Gangplank is a really fun champion to play and in my opinion he is one of the best in the game, of course only if he is played right. Thx for reading this it is my first guide so give me tips to improve my work.