The Excel formula bar is a great tool that allows you to quickly enter and edit cell formulas. However, it can be a bit tricky to use at first. Here are 15 keyboard shortcuts that will help you use the formula bar more effectively:

1. Ctrl+A: Select the entire contents of the formula bar.
2. Ctrl+C: Copy the contents of the formula bar.
3. Ctrl+V: Paste the contents of the clipboard into the formula bar.
4. Ctrl+X: Cut the contents of the formula bar.
5. Ctrl+Z: Undo the last change made to the formula bar.
6. Ctrl+Y: Redo the last change made to the formula bar.
7. Ctrl+F: Find the next instance of the selected text in the formula bar.
8. Ctrl+H: Replace the selected text in the formula bar with the specified text.
9. Ctrl+G: Go to the specified cell in the worksheet.
10. Ctrl+O: Insert the specified function into the formula bar.
11. Ctrl+U: Change the selected text to lowercase.
12. Ctrl+Shift+U: Change the selected text to uppercase.
13. Ctrl+Space: Select the entire column of the active cell.
14. Shift+Space: Select the entire row of the active cell.
15. Ctrl+Shift+F: Apply the specified cell format to the selected cells.
16. Ctrl+Shift+P: Apply the specified number format to the selected cells.

These keyboard shortcuts will help you quickly enter and edit cell formulas in Excel. Give them a try the next time you are working with formulas in Excel!