The so-called investment is to put your valuable things into a certain field in order to seek greater returns in the future. What do college students have besides time? If you have to say it, you will also "invest" your energy and time in learning and concentrate on learning professional knowledge. As for contacts, appearances and experiences, it is empty without your own ability.
There are always college students who think that what they learn at school is useless. What is really useful is not in the classroom, but outside the classroom. This kind of anti-intellectualism thought appears on college students, which is a great sorrow.
No matter when, for most people, cultural knowledge is the capital that will not depreciate the most. Those who succeed without knowledge either have extraordinary talents or excellent innate conditions. In short, they are all acquired capital, let alone acquired through "investment".
Back to the question, where should college students invest for themselves?
There is no "what", there is only one aspect worthy of college students' investment, and that is cultural knowledge. This is an aspect that no matter what your innate conditions and talents are, there will be no risk and the return will be worthy of your "investment". After all, no one with mental defects can be admitted to the university.
Always be wary of those who encourage you to invest in contacts, looks or even simple finances. Now the rules of human society are gradually weakening, and the external capital will gradually disappear with time.
In a mature society, talents with excellent professional ability are talents, and universities are the generation with the best learning state in one's life. Don't live up to it.