It is a cognitive bias that describes the fact that when you know something, it's very difficult to know what it's like not to know it.
The things you know seem so obvious to you and you assume that everyone else knows them too.
Seek feedback. What it's obvious to you might not be obvious to the others.
Show your message to other people and have them honestly say how clear it is to them.
Use words that will help people understand what you’re trying to say rather than words that are confusing or distracting.
Avoid using jargon, idioms and obscure metaphors.
Write your message and put it aside. Come back to it after a while and read it again.
It will give you a fresh perspective on it.
The most important part of writing is rewriting.
For every sentence, ask: ‘Is that actually conveying to someone other than me what I mean for it to convey? Can I state it more succinctly, more concretely?’
Good writing comes from perfectionism; meaning it lets you identify what isn’t working and how to fix it, and the rewritings hone your technique. Perfectionism is fundamental when you may only have one chance to show your work to an agent or a publisher.
But you also need to stay optimistic, otherwise, you'll get depressed and quit.
Forget what you know and want. Everything, from the shape of your argument to the choice of vocabulary, should be governed by your audience’s receptivity.
The key principle of persuasive writing is customer service. Ask what they do and don’t know about the subject, and what they need to. Ask what they are likely to find funny. What are the shared references that will bring them on board? Where do you need to pitch your language? How much attention are they likely to be paying?