Be aware of your tone
You can’t give non-verbal cues when you’re communicating online. The reader can only see your text, and if it’s improperly written, misunderstandings will happen. Make sure you read your text carefully so people can interpret the meaning of your text clearly.
Be wary of using irony or sarcasm.
DON’T SHOUT! Using all caps can be interpreted as shouting at someone. Instead, italicize, underline or bold text as a form of emphasis.
— a text about netiquette based from my English textbook, not gonna copy it verbatim for legal reasons