If you select a cell containing a VLOOKUP function and press F1, Excel shows the help article specifically for VLOOKUP, complete with syntax, detailed descriptions of each argument, and examples.

The debt service coverage ratio (DSCR) is used to measure a company’s cash flow available to pay current debt. Learn how to calculate the DSCR in Excel.

You can have Excel make a spreadsheet in read only format for others, so that people can read its contents but not edit them, or you can enforce other content restrictions.

Excel and Google Sheets have three functions to calculate the internal rate of return: IRR, XIRR, and MIRR. Learn how these functions can calculate investment returns.