Chào bạn Phamthunhien
Online course is a course that can help us study anywhere, anytime. And of course and the course is that we buy online through famous selling sites such as: Unica, Edumall. When you study online, you don't understand any place. You can rewind that place to help you learn better
Chúc bạn học tốt
-Yasou-(QTV)