Your brand tells readers what to expect from you as an author, as well as what to expect from your books, and it is built over time.
The Write Practice.
It's All About How People See You
Your author brand is created by the information you put out to the world. Which simply means, any books, posts on social media, videos on YouTube etc. Things like your logo and website are all part of your author brand and should be consistent throughout your work as a writer.