Log in, enter the post sub-office, choose autonomous learning, find courses in the online school resources (pay attention to the length of class hours and credits, many of which have no credits, so you must choose credits, and it is best to choose courses with short credits), then choose courses, customize resources, and then click on your customized resources for personal learning and maintenance. Be sure to complete the required course duration so that you can get the corresponding course credits the next day.