Player skills: what each skill means?

Hello everyone
I have been looking for a guide for skills.
What is creativity?What is aggression? A player with high dribling wouldn't be really good if he had also speed?
And most importantly how do I choose a player for corner kicks? For many seasons I have players with corner kicks SA but do not seem to work really well.
Here is a player as an example.
Attachment 133024
Would the player below be a better choice for corners? And if so, how do I tell?
Attachment 133025