Sometimes I record a voice memo and transcribe it. Most of the time I just write and re-write and re-write and re-write until i'm happy.

First I just get the content out of my brain and into written form, then move things around, add stuff, remove etc till i'm happy with the flow. Once i've fixed flow, then I get a few people from my target audience to read it just in case they have any objections to the content in anyway. I then make adjustments based on feedback and then i put my content in hemingwayapp and tighten up the text to make the writing bolder.

After that, i get my wife to check it for general readbility and then i re-read it myself once more.

Mostly it's just writing and re-writing till i'm happy.