How the three link
The three statements are one story told three ways. Numbers from one show up in the others.
Profit grows equity
The profit at the bottom of the income statement is added to the owners' part (equity) on the balance sheet, unless it is paid out to them.
Cash flow explains the cash
The cash flow statement starts with last year's cash and ends with the cash on this year's balance sheet. Every euro in between is explained.
Timing gaps sit on the balance sheet
A sale not yet paid becomes money owed to the café. A bill not yet paid becomes money the café owes. Both wait on the balance sheet until the cash moves.
Reading them together
Profit rising but cash falling? Look for customers paying late or big purchases. Equity falling with a profit? The owners took more out than the café earned.