Broadly agree with Jonathan. A couple extra suggestions:
1) Subscribe to Finimize: They will send you daily updates with recent business/finance news, and explain what is happening (and why) in Layman terms. It's an excellent way to both stay up to date with most recent events in a couple of minutes (e.g. on the commute to work) and also improve your business acumen.
2) Read up on some basic business/microeconomics: Any decent first year of University or even advanced highschool economics should do - to get the basics and understand some key terms (e.g. economies of scale, breakeven point, etc.)
3) Also read through cases to further improve if you run out of cases to watch/listen to
Hope this helps!