"This travel app is a series of guides covering the cultural and alternative side of a city, the side that is almost never covered in conventional guides."
Please advise if I need to use a dash or a comma. Thank you.
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The way you have it (with a comma) works perfectly fine and is probably best for what you are using this for (I'm assuming for the description of an app). A colon might be the better technical choice, perhaps in some formal essay, but the comma serves as a less distracting, natural pause. When considering the use of colons and dashes I think it's best to consider the context. You're probably not writing to an audience who expects technically proficient grammar, so it's ok to use a comma.