Copywriting
Voice, Tone & Content Guides
http://voiceandtoneguides.webflow.io/
Curated editorial and copywriting tone guides from respected teams
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Readability Guidelines
It's amazing to see changing the text alone improve readability and usability. This wiki has provided more than 100 guidelines on how to write and design for content.
Grammar Report
Shira Stieglitz shared her insights on the importance of grammar and spell check, via easily measured test by Google Ads.