So if you came here to know how to write, Stephen King wrote a book "On Writing" that is quite interesting and mostly reads like a novel. See it as a "I'll read this and I'll get motivated to write".
If you came here to understand how to get into blogging: just start. Create a wordpress, and just start writing. Focus on content, not on form. After a while, you can think about a domain name, about a custom theme, or about hosting this yourself on github with hugo. But don't start with the technical parts of managing a blog, just write.
If you came here to understand how you can become a good technical writer: keep writing. Consistence over years of writing is what makes you a good writer. The ultimate technique for me is to give an interactive talk to people about your ideas, and see where your audience get stuck, where they ask questions, how different ways of explaining something get the point across.
Malcolm Gladwell does more than this: he explains an idea multiple times in different ways. If you have the page count to do this, do it. Different people need different ways of explaining.
(shameless plug: I'm writing a book on crypto https://www.manning.com/books/real-world-cryptography?a_aid=...)