Don't assume people know things. Know exactly what you want to share and search what they know.

Begin by explicitly deciding what you want people to get out of your explanation. Try to keep this as small as possible.
Begin all explanations either by asking what they already understand or by considering a model recipient of the explanation.
Think explicitly in terms of the abstraction stack between your end goal and where the recipient is now.

There’s nothing in the above for helping people unlearn prior flawed understanding, cognitive difficulties or motivation to understand and learn.