Recommended online courses for UPSC preparation include platforms like Unacademy, Coursera, and edX, which offer comprehensive courses tailored for various subjects. Courses focusing on General Studies, Current Affairs, and optional subjects are especially beneficial. They often include expert lectures, practice question banks, and interactive quizzes. Additionally, platforms like BYJU’s and Insights on India provide targeted courses specifically for the UPSC exam. Engaging in these structured courses can help aspirants reinforce knowledge and stay updated with current trends relevant to the syllabus.