Judging from the Q in your name (!) I'm guessing you have some Indian Muslim heritage and maybe an association with "Urdu." It's true that in Urdu, people don't care for a distinction between singular vo and plural vo. However, in the standardized/literary "Hindi," people make a distinction between singular vo (which they spell as vah) and plural ve. "Hindi" spoken on the street will be like "Urdu" in this sense, so one can question the value of learning this "ve" thing. Knowing it lies mainly in the fact that literary people do recognize it. It mean... that's why it's in this course; they didn't just make it up!