就这段举个例子:你开头改learn a lot of knowledge.你的举例是能够帮助你在其他方面解决问题。所以我觉得中心句(第一句)就是you can apply the skills and knowledge into to other fields, which are of great helpful to combat some common but not professional problem.
2.第二点也就是说了,你的中心句是knowledge,那就例子就是应该更好的学习更多知识。比如learn computer skills, 你可以学习一下computer hardware circuits, 学会word 编辑,学会和customer 怎么打交道啊。这些多事amounts of knowledge.
3.还有第二段开头是倒装句。Never.
最后,互相进步。我存在很多问题。也是不太会展开,展开也是牛头对马嘴。