Entering data into a cell in Excel is a very basic but fundamental step. Here's how to do it:

1. Select the Cell: Click on the cell where you want to enter your data. You can identify cells by their address, which is a combination of a column letter (A, B, C...) and a row number (1, 2, 3...).
2. Type your data: Simply start typing the information you want to enter, such as text, numbers, dates, etc.
3. Press Enter or Tab: Once you've finished typing your data, press the "Enter" key to finalize the entry and move down to the next cell in the row below. Pressing the "Tab" key will move you to the cell to the right in the same row.

Here are some additional points to keep in mind:

* Data Types: Excel can handle different data types. Numbers will be formatted automatically as numbers, while text will remain as text. You can also format cells manually to specify how you want the data displayed.
* Editing Data: If you make a mistake or want to change something, you can simply double-click on the cell to edit the content directly.
* Formulas: While you can enter numbers directly, you can also use formulas to perform calculations within cells. Formulas begin with an equal sign (=) followed by your calculation using cell references, numbers, and operators.

By following these steps, you can easily enter and manage data within your Excel spreadsheet.