1. An excel in left hand side u can see 1, 2, 3, 4, …. “Horizontal line” this is called “row” and vertical line A, B, C, D, ……. This is called Column. More information see picture.
picture how to use excel
First select where you want to make border
Method “A”
Go to the home tab look the Font and do what you see in picture.
Method “B”
Select and right click inside your select section and go to the format cell and more see picture….
Select style > presets>outline>inside, if you need color click color and select your color…
How to make border in excel picture
picture-1 methode-"A"