/biz/ - Business & Finance

I just got /filtered/ out of my business administration curriculum because Microsoft Excel was the first course I had to take and I didn't learn it in time. I just failed the final exam earlier today. I'm probably going to switch majors to engineering or health science. What are some resources to self study business on my own? I wanna be like you guys and business has always been interesting but I don't know a thing about investments, entrepreneurship, marketing, etc