Recommended online platforms for UPSC study material include well-established sites like Unacademy, BYJU'S, and ClearIAS. These platforms offer a variety of resources, including video lectures, practice tests, and comprehensive study materials tailored for UPSC aspirants. Forums and social media groups also provide peer interaction, enabling knowledge exchange among aspirants. Engaging with diverse materials, like current affairs magazines and online quizzes, can diversify preparation methods. Careful selection of trustworthy sources ensures effective learning and efficient preparation strategies.