Currently Actual comes with two reports: net worth and cash flow. These are valuable reports, but in the future many more report types will be available.
There will also be a way to create custom reports. Coming soon!
Net worth shows the balance of all accounts over time. Your net worth is all of your cash and assets minus and debts you owe.
Cash flow shows your spending over time. It only looks at budgeted accounts and shows their balance over time, and includes separate income and expense visualizations. It's a quick way to see how your income and expenses effected your available money over time.