When an accountant hands over finished books, they are ineligible.
Funnily enough, there is a whole branch of accounting dealing with transforming accounting data into a form readable by managers. It's usually done by financial controllers.
But it doesn't hurt to have basic understanding of the main accounting statements and what they show.
Balance sheet, the oldest one, shows what your company owns and what it owes. It has assets in form of buildings and machinery, cash in bank accounts, and accounts receivable (promised payments). On the other side you have debt, accounts payable (your future payments) and equity of the owners.
The income statement is the most commonly reviewed. It shows revenues and corresponding costs, divided into cost of goods sold, salaries and administrative expenses. It subtracts paid interest and taxes and shows the net income. Which you use to pay debt or dividends or in any other ways.
The third statement is the cash flow statement. Cash flow is crucial for operating a business and investing. It shows the actual money generated. The statement includes all cash inflows that are not considered current revenue, such as advance payments.
It also shows cash expenses that do not appear in ordinary expenses, such as prepayments. Investments into inventory and raising new equity are also important parts of cash flow.
Out of those 3, be mindful of your cash flow and pay close attention to your income statement. A good accountant can show you in more detail how your different expenses evolve with regards to earned revenue, so make them work for your money.