Would you please modify where it sounds unnatural?

Are there any mistakes in this article? Would you please modify where it sounds unnatural? Thank you~

I agree to this opinion.
Life experience is one of the best teachers for children. Taking a part-time job can let them learn a lot and it is definitely more than just staying at home.
Firstly, taking a part-time job can let them know more communication techniques. In this way, they can learn how to talk to others effectively and in a friendly manner which they can't learn well from parents word by word.

Secondly ,when they work, they can use what they have learned at school. As an old saying goes, action speaks louder than words. Practicing is the best way to test whether they comprehend the knowledge or not.

Thirdly, in some cases , they have to solve the problem by themselves and try all the ways that they can think about.
They may fail a lot of times at the beginning. but it is important to encourage them to think independently and make direct decisions as It's a good way to challenge themselves.

Fourthly, taking a job is so exhausting that children would be more thankful to parents. As we all know, no pains no gains. However, they must feel more about this sentence. Since they know how hard it is to earn money, they would not spend it casually.

Last but not least, when they finish their part-time job, they must be profound of themselves which is helpful to build up confidence. Which is good for studies.

In a word, taking a part-time job indeed is one of the best ways to help their teenage children prepare for adult life. It's more meaningful than staying at home and watching TV. They practice their abilities and learn a lot out of textbooks. Anyway, action speak louder than words.