Keep it short and simple
Mark Twain was remarkably right when saying, "Writing is easy. All you have to do is cross out the wrong words." UX writing should be not only concise but also meaningful.
It's not just that users' attention capacity requires UX copy to be short. Digital interfaces, especially mobiles, have limited space. You can't use long sentences simply because they won't fit anywhere. Remove unnecessary modifying words, slang, and redundant punctuation (commas, semicolons, and clauses) that overcomplicate sentences and don't carry any value.
Pro Tip: Remember that words also get accompanied by icons and visuals that convey information faster than words. So make sure they work in tandem and deliver the message without any fluff.
