There are two main ways to change the font size, style, and color of text in cells within Excel:

Method 1: Using the Ribbon

1. Select the cells: Click on the cell(s) you want to format. You can select a single cell, a range of cells, or even entire columns or rows.
2. Navigate to the Home tab: On the Excel ribbon, find the "Home" tab. This tab contains most formatting options for your spreadsheet.
3. Font formatting options: Look for the "Font" group within the Home tab. There you'll find several options to modify the appearance of your text:
- Font Family: Click the down arrow next to "Font" to choose a different font style (e.g., Calibri, Arial, Times New Roman).
- Font Size: Click the up or down arrow next to the font size (e.g., 11) to increase or decrease the size of your text. You can also type in a specific size value.
- Font Color: Click the down arrow next to "Font Color" to display a palette of colors. Choose the desired color for your text.
- Bold, Italic, Underline: These buttons allow you to apply bold, italic, or underline formatting to your text.

Method 2: Using Keyboard Shortcuts

Excel provides handy keyboard shortcuts for quicker formatting:

- Bold (Ctrl+B): Press and hold the Ctrl key and then press B to make the selected text bold.
- Italic (Ctrl+I): Press and hold Ctrl and then press I to italicize the text.
- Underline (Ctrl+U): Hold Ctrl and press U to underline the selected text.
- Increase Font Size (Ctrl+Shift+P): Hold Ctrl, Shift, and P keys together to increase the font size.
- Decrease Font Size (Ctrl+Shift+O): Hold Ctrl, Shift, and O keys together to decrease the font size.

Additional Tips:

- Format Painter: If you like the formatting of a particular cell and want to apply it to other cells, you can use the Format Painter tool. Click on the formatted cell, then click the Format Painter button (paintbrush icon) in the Home tab. Now, click on any other cells you want to apply the same formatting to.
- Conditional Formatting: While not directly related to font properties, conditional formatting allows you to automatically change the font color or style based on certain conditions within your data. This can be useful for highlighting important information.

By using these methods and exploring the formatting options in the Home tab, you can customize the appearance of your text in Excel to enhance readability and make your spreadsheets visually appealing.