Let me just throw some key words of financial terms at you which you should very familiar with: revenues, cost, profit, ROI, payback period, COGS, CAGR, NPV, balance sheet, income statement. Important frameworks/concepts are: profitability, 4 Ps, 3 Cs, Porter 5 forces, Breakeven, SWOT, PLC. I think you can find most important information on the bootcamp part here. What I did is go through that and if I had trouble with one particular thing I googled it and there are many free sources that are really helpful. I haven’t studied with a book, so I can’t recommend you one, sorry. Hope this still helps!