Go online and search "How to prevent children from playing with mobile phones" and so on. Set passwords for all the controllable software and functions first. And don't play mobile phones at night, set an alarm clock to get up and play around 3 o'clock. At that time, parents were almost asleep.

In the long river of seeking truth, only by studying, constantly studying, diligently studying and creatively studying can we cross mountains and mountains. -Hua Luogeng.

Learning is as loving as a mother. It nurtures children with pure and gentle joy. It may be a sin to ask for extra reward from it. -Balzac.

There is a famous saying about learning:

Learning is like sailing against the current. If you don't advance, you will retreat. -"Augmented Xianwen".

learning without thinking is useless, and thinking without learning is dangerous. -Confucius, The Analects of Confucius.

To learn knowledge, you should be good at thinking, thinking and thinking again. -Einstein.

Learning without learning is useless, and using without learning is sluggish; Learning and application must be combined, and both are indispensable. -Zhou Haizhong.

We must set ourselves such tasks: first, study; second, study; third, study. -Lenin