Sorry if this is posted anywhere but cant find the answer via google.
Why are the #Include Libraries lines different colors?
Why are the #Include Libraries lines different colors?
Do you mean why are they coloured or why are some of then in different colours ?
EIther way the answer is that each library can have a file named keywords.txt associated with it that defines the colours used for the name of the library and its methods. The idea is that when you type a keyword such as Serial.begin it is coloured to indicate that the method exists in the library whereas if you incorrectly type Serail.begin it is not coloured and you notice your mistake.
The colours have no real significance and if a keywords.txt file is not provided with a library it will still work OK.