Here is a pdf containing most of the key terms in finance and economics that you will need in your startup. It also includes a summary of how the financial statements (cash flow, balance sheet and income statement) operate.
The web sources are given below.
- Section 1 contains accounting terms
- Section 2 contains finance and economic terms
- Section 3 contains a summary of “how to keep score in business“
If you are interested in a more in-depth view of finance, accounting and how to read and interpret financial statements, Robert Follet’s book is pretty good.