By default, colors and fonts are loaded into the Home menu / Police.
Ditto for the effects applied to the forms
Now you can change themes by going to the Page Layout tab and then scrolling through the different themes that are available and you select (in this example: Opulent style)
Therefore, the color, font and effects on the forms are changed.
For example you can see on the following image as the font of the headers of rows and columns has been changed.
Although new versions of Excel offers more tools at your disposal, you will probably want to want to access features that are not present in the menus.
For this you can add your tools in the Quick Access Toolbar.
The following video shows you how to add the standard menus to draw the borders.