Very informative post ! I got some more details as below to get clear idea of how to and when to use dash.
"
A dash is a mark of separation stronger than a comma, less formal than a colon, and more relaxed than parentheses.
-grammarian William Strunk Jr"
In normal circumstances, other punctuation marks (commas, colons, or parentheses) should be used. However, when you want a phrase or another part of the sentence to have extra emphasis, a dash may be used.
Examples with correct usage:
1. The first thing the lazy employees did when they arrived at work—besides slowly drinking their coffee—was to turn on their computers so the boss would think they were busy at work.
2. The only thing Tony could do—if he could do anything at all—was to sit and wait for the test results to come in the mail.
3. Sam—even though she fears clinics terribly—went to the doctor with me today.
@Marcab,
Do you have any OG Sentence correction question on dashes