I am new to this code, but learning very quickly.. Just a question.
How do I know all codes in a library .. Eg. servo code for continuous motor (90) means stop if I use another motor, let say 180 deg, it means go to 90 degree point.
Is there any way I can print a library with all its meanings and memorize them..
I would just need help in printing the memorizing I can do on my own..

Eagle
Your servo example is not a good one because the Servo library expects to move a servo to a position based on the value used in the write() or writeMicroseconds() functions but where the servo actually moves to depends on the servo hardware.
A continuous rotation servo will move at a speed and in a direction depending on the value written whereas a real servo will move to an angle and stay there. Even a real servo may not be able to move through the full range that can be written due to mechanical limitations or it may be able to move much further as in the case of a sail winch servo.
A good library will come with documentation of the functions available and examples of their use, but many don't. If all else fails you can look in the library .h and .cpp to see which functions are available