There are a few different ways to get context-sensitive help in Excel. One way is to use the F1 key. When you press the F1 key, Excel will open the Help window and display information about the function that you have selected. Another way to get context-sensitive help is to use the Help button on the toolbar. The Help button looks like a question mark and is located in the upper-right corner of the Excel window. When you click on the Help button, Excel will display information about the function that you have selected.
You can also get context-sensitive help by selecting a function from the Insert Function dialog box. To open the Insert Function dialog box, click on the Formulas tab and then click on the Insert Function button. When you select a function from the Insert Function dialog box, Excel will display information about that function in the Help window.
Finally, you can get context-sensitive help by using Microsoft Office Online. To access Microsoft Office Online, click on the Help menu and then click on Microsoft Office Online. This will open your web browser and take you to Microsoft's website. On Microsoft's website, you can search for information about Excel functions.