This might be outdated, and I don't know if I agree with all of the points today. I wrote this guide for my sister in 2016, when she was getting ready for college (hence the direct tone), and might still be useful.

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1. Networking. Your diploma is not good enough to get you a job.
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50% of the unemployed people in the US have a college degree. Even having good grades isn't enough. I finished Grad school with a 3.8 GPA, and after six months of frustrated searching, became a security guard - a job that required a GED. When building a network, think quality, then quantity. Do this by adding value to others (remember, people are selfish), and eventually a real bond is formed. Be helpful to the people worth helping.