tSchool education is very important and useful ,Yet one can

个人认为原句应该为：
School education is very important and useful ,Yet no one can learn everything at school and a teacher can't teach his students everything they want to know
翻译：
学校教育是非常重要和有用的,但没有人可以在学校学到一切和老师能教他的学生想知道的一切

It can be very useful to understand. Etiquette is very important idea to understand 第一个句子中的to understand做主语，it是形式主语。第二个句子