Backgrounds, borders, colors, and text make a form easy for users to understand and work with.
You can select visual effects for a whole form, for a section of the form, or for individual controls. Backgrounds, borders, colors, and text are among the many visual effects you can customize in a form.
To use a picture as the background of a form, you would open the form in Design view, and then double-click the form selector (the box where the rulers meet) to display the form's property sheet.
You would select the Format tab, and then scroll down to Picture and click that word or the box next to it, causing the three-dot Build button to appear. Clicking that button would open the Insert Picture dialog box, where you could choose the image for the background.
To change the look of a form section, you would open the form in Design view, right-click in the section you want to change, and then click Properties on the shortcut menu. Selecting the Format tab would show a list of choices, including background color, height, and several other settings.
Access gives you so many ways to select and change the appearance of controls on a form, we offer a separate course entirely about controls. When you have finished learning about forms, you will be ready for "Take the controls."