Exceljet

Quick, clean, and to the point

Add or remove border vertical interior

Windows shortcut 
AltV

On Windows, this shortcut only works within the Format Cells dialog box, on the Borders tab. If you use this shortcut in Format Cells, you'll see a interior vertical border added or removed from the border preview area.

There is no equivalent shortcut on the Mac

Your videos are the best one I have seen so far. I use excel in my advanced acc. techniques course and may be coming back to you for some tailored chosen set of videos. - Joanna
Excel foundational video course
Excel Pivot Table video training course
Excel conditional formatting video course
Excel formulas and functions video training course
Excel Shortcuts Video Course