Google Classroom: This should be your first stop for information. You'll be able to easily locate class announcements and assignments.
AP Classroom: You will need to access this throughout the school year for select assignments and classwork. The join key will be given in class.
DeltaMath: You will also need to access this throughout the school year for select assignments and classwork. The link to join the class will be given during Week 2 of the school year.
Textbook website: Resources include pre/post chapter assessments, videos aligned to each section, videos of how to workout the "Checkpoint Exercises" for each section.
CalcChat: Shows steps to odd problems from the textbook and has online tutors that you can chat with during their tutor hours.
Desmos:
Khan Academy: Watch video lessons, do practice problems and get feedback on your progress.
HelpNow! by Brainfuse: Log in using your LA County Library card and access online tutors in any subject.