There are many online resources available for Griffiths' Introduction to Quantum Mechanics. Some popular options include online lecture videos, practice problems and solutions, and interactive simulations. Some recommended websites include Khan Academy, MIT OpenCourseWare, and Coursera. Additionally, there are many forums and discussion boards where students can ask for help and clarification on specific topics. It's always a good idea to do some research and explore different options to find the one that best suits your learning style. Best of luck in your studies!