For finance knowledge, I'd volunteer to be a treasurer at a local non-profit, or HOA, or similar organization. That's a great way to get to read balance sheets, income statements, and more, in a real world scenario.

The world of business is large. I'd probably read up on the particular domain your focusing on (real estate? sales? telephony? etc). Find subject matter experts at your company and take them to coffee and ask what they read or recommend.