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While I was talking about the difference between two people or things, I tried to shorten the contrast by using not and don't and to this moment I don't know whether what I do is grammatically correct or not?
For example:
Some people think taking part in those classes could be useful and some others don't.
I like watching movie,whereas my sister doesn't.
They are good at selling but another group not.
some people can afford that house.others can't.
Your usage of "not" and "don't" is correct, but there are other things in the sentence that are incorrect. For example:
Some people think taking part in those classes could be useful and some others don't.
This is correct, but the more idiomatic way to say this is:
Some people think taking part in those classes could be useful and others don't.
I like watching movie, whereas my sister doesn't.
In this sentence, "movie" should be pluralized to "movies"
They are good at selling but another group not.
This sentence is missing a word. The word "not" should be used with an auxillary verb. (Verbs like "be", "would", "did"...)
Here, you should add "is" before the not.
They are good at selling but another group is not.
or even
They are good at selling but another group isn't.
