Leonard Susskind offers a series of quantum mechanics lectures on YouTube through Stanford, which are recommended for upper-division undergraduates. For graduate-level content, a course available at pirsa.org is suggested. High school students express interest in these lectures, questioning their depth and suitability for serious study. Additionally, an entire quantum mechanics course from Oxford University is available on iTunes U, and other resources include a course from UCSD and NPTEL. These various options provide a range of materials for different educational levels in quantum mechanics.