Many technical posts need technical ability and foundation. Most college students are at a loss at school, don't know the direction of their efforts, and don't know the use of learning those difficult and obscure things in the future. Many students play games and fall in love, and basically can't learn anything. For many college students, four or three years of life is just playing in another city. This is not only due to the students themselves, but also to the unreasonable and unattractive curriculum of higher education.
Nowadays, many technicians are masters of 2 1 1/985, or excellent undergraduates of famous universities, which basically has nothing to do with two books and three books.