I have 20 years of working in spread sheets. I have thorough knowledge in formulas and analysis. Excel is used widely in any financially-related activity. The ability to create new spreadsheets where users can define custom formulas to calculate anything from a simple quarterly forecast to a full corporate annual report makes Excel highly appealing. Excel is also used widely for common information organization and tracking like a list of sales leads, project status reports, contact lists, and invoicing. Finally, Excel is a useful tool for scientific and statistical analysis with large data sets. An Excel document is called a Workbook. A workbook always has at least one Worksheet. Workseets are the grid where you can store and calculate data. You can have many worksheets stored inside a workbook, each with a unique worksheet name.
Worksheets are laid out in columns (vertical) and rows (horizontal). The intersection of any given row and column is a cell. Cells are really where you enter any information. A cell will accept a large amount of text, or you can enter a date, number, or formula. Each cell can be formatted individually with distinct border, background color, and font color/size/type.
You can create simple and complex formulas in Excel to calculate just about anything. Inputs to a formula may be other cells, the results of other formulas, Excel offers a wide array of charts to visualize data. They range from simple line graphs to bubble and radar charts.