#46: Proofread People
Even though it might seem like more work, the act of proofreading saves you time in the long run. And when you are constantly handing in work to be published, it can be frustrating for someone else to have to constantly proofread your work.
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And there is nothing more awkward than walking past someone and hearing them talk about you or your work in the office. Sure, this comment could have been about anyone in the workplace, but if you work in copywriting, remember to always proofread your work.