You can change the background color of the cell or text color.

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Changing Background Color

By default the background color of the cell is white in MS Excel. You can change it as per your need from Home tab » Font group » Background color.

Change Backgropund Color

Changing Foreground Color

By default, the foreground or text color is black in MS Excel. You can change it as per your need from Home tab » Font group » Foreground color.

Change Foreground Color

Also you can change the foreground color by selecting the cell Right click » Format cells » Font Tab » Color.

Change Foreground Color by formatting cells