As you can see from the guide so far, when using an em dash we rarely put a space before or after the punctuation unless we are using multiple em dashes together to represent an omitted word such as in the section above. Some establishments require you to write to a certain style guide which may ask that you do place a space before and after the em dash, so make sure you find out what they accept when writing for a business or something similar.

We also only use multiple em dashes when showing a word has been omitted. Besides that, we should never use over two in a sentence when the em dash is being used to replace commas or parentheses to supply additional information.