You can use the ribbon command Home | group Format | Cell styles 
to apply "Cell styles".
Cell styles are a combination of cell attributes (number format, orientation, borders, etc.) and a character format (font, font size, etc.) that you can save. Once saved, you can repeatedly apply this cell style to any cell.
If, for example, you want to frequently format cells with the number format "Percent", red background and bold font, simply create a corresponding cell style and apply it to the desired cells.
For more information, see the following pages.