In 2–3 sentences, describe how you would change the background of a group of cell

Highlight the cells you would like to change. Go up and press background color. choose the color you want. and press done.

We can do it by using the format tab

We can change the background of a group of cells by selecting the cell or range of cells we want to format. We should Click Home > Format Cells dialog launcher, or press Ctrl+Shift+F from the keyboard. Then on the Fill tab, under Background Color, we pick the color we want. To use a pattern with two colors, we pick a color in the Pattern Color box, and then pick a pattern in the Pattern Style box. In this tab we can also select gradient or single color.