Learners learn how to Variation and upgrade an app, increase app scalability and performance, and troubleshoot common issues with the application."When I need courses on subject areas that my university doesn't present, Coursera is the most effective areas to go."B??c 2: Ng??i ch?i ch?n 1 tài kho?n thanh toán duy nh?t ???c h??tr?? ti?p ?ó b?n ti