Proper use of ellipsis

You would not use an ellipsis when the omitted words are at the start or end of your quotation.

Thanks. I didn't know that, either.

In general, (I am paraphrasing the APA Style Guide) it is not necessary to use an ellipsis at the beginning or end of a quotation, even if you are quoting from the middle of a sentence. However an exception is that you should include an ellipsis if, to prevent misinterpretation, you need to emphasize that the quotation begins or ends in midsentence. However, it is not usually necessary to do this.

Use an ellipsis in the middle of a quotation to indicate that you have omitted material from the original sentence, which you might do when it includes a digression not germane to your point. You should take take care when omitting material to preserve the original meaning of the sentence.

You can also change the first letter of the quotation to be capitalized or lowercase depending on what is needed for the grammar of the sentence in your paper.

A longer quotation might span multiple sentences. Use four ellipsis points (rather than three) to indicate any omission between two sentences. The first point indicates the period at the end of the first sentence quoted, and the three spaced ellipsis points follow.

Some style guides require that there be a space before and after an ellipsis, and also that the dots are separated by dots, others do not.

I got voted to zero for that???