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Every Excel spreadsheet contains rows and columns. Most of the time, columns are identified by letters (A, B, C), and rows are identified by numbers (1, 2, 3). In Excel, this is known as the A1 reference style. However, some prefer to use a different method where columns are also identified by numbers. This is known as the R1C1 reference style.
 R1C1 reference style vs. A1 reference style
R1C1 reference style vs. A1 reference styleWhile the R1C1 reference style is helpful for certain situations, you'll probably want to use the A1 reference style most of the time. This tutorial will use the A1 reference style. If you're currently using the R1C1 reference style, you'll need to turn it off.
 Clicking the File tab
Clicking the File tab Clicking Options
Clicking Options Turning off the R1C1 reference style
Turning off the R1C1 reference style/en/excel2013/4-free-alternatives-to-microsoft-office/content/