That if you are speaking to someone through message or email or any written message it has no tone. You may say something with good intentions & someone may take it the wrong way.
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America is awash in ugly, hateful speech. White nationalists march defiantly, and their slogans are echoed in murderous rampages. Government officials revel in disparaging the very people they patrol. Many people—and I’m one of them—argue that the president’s rhetoric encourages this grotesque and shameful state of affairs even as he nominally condemns it. This has all led to more discussion about free speech and its limits.
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inside and outside addresses
formal salutations and closings
subject lines specific to the topic
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The main idea is the point of the paragraph. It's usually a sentence, it is usually the the first sentence. But yeah that's all I know. I hope I helped at least ._.