For example, in Mile Mile, there are many teaching videos uploaded by university professors. Now, Billie Billie is the learning website chosen by many people, and of course, there is math. You can search for college mathematics, and many videos will come out, which will be watched by many people. Don't worry. Or you can sign up for some online schools. There are many online schools now, and a hundred flowers blossom. You can find one that suits you.

People and knowledge are interactive and progressive, and there are many resources, but it is more important to learn by yourself.