official link:
1.https://secure-media.collegeboard.org/digitalServices/pdf/ap/ap-computer-science-principles-course-and-exam-description.pdf
2. http://apcsp.org/index.php/about
3. https://code.org/educate/csp
Python
1. https://www.codecademy.com/learn/python
2. http://www.tutorialspoint.com/python/python_classes_objects.htm