I just truly understand how important the profit and loss statement is for investing. It turns out most people don't know about it at all.

The profit and loss statement, also called the P&L Statement, is a financial report that shows the company's operating results, whether it makes a profit or incurs a loss during a specific period. Its importance lies in telling you how much money the business makes, where the money goes, and what remains in hand.

The calculation method is very simple: total revenue minus total expenses equals profit or loss. If revenue exceeds expenses, it indicates a profit; if expenses are higher, it’s a loss.

The revenue we talk about has two types: primary income from selling products or services, and additional income from other sources, such as bank interest, dividends, or rental income. Expenses also have many categories, including production costs, advertising, rent, and salaries.

What’s interesting is that there are multiple levels of profit: gross profit shows how much the selling price exceeds the cost; operating profit indicates whether the business is on a good trajectory; and net profit is the actual remaining money after deducting everything.

There are two formats for preparing the profit and loss statement: a simple report that provides an overall view, and a T-account style that shows more detailed information. Both have their advantages but present the same data.

Why should we care about this statement? Because it helps measure the financial performance of a business. It helps us understand whether the business can generate profit. The data from this statement also aids in strategic planning and investment decisions.

When reviewing the profit and loss statement, check the period—whether monthly, quarterly, or yearly—and see if there’s a profit or loss. Look at the sources of income and expenses. If you understand where the money goes, you can analyze how the business should adjust to improve.

But remember, investment decisions shouldn’t rely solely on the profit and loss statement. Other factors should be considered, such as the nature of the business, the management team, and technical data supporting growth. Combining all these will lead to better decision-making.