Unless you’re an established author with an agent, when you write books, you also have to write blurbs. Back matter. Short descriptions, long descriptions, author biographies, while taking each platform’s word or character limit into account and the platforms’ peculiarities.
An example of the latter is that for the description of paperbacks on Amazon, you have to code paragraphs in html, but not for the Kindle version. (You discover that the hard way.)
Also, the size limit that is indicated while you’re adding that blurb is not the limit that is applied in practice. So you either have to keep it short and sweet, or wait to see if your description will be cut short in mid-sentence in practice. Eventually, you get used to it and learn how to avoid this pitfall.
In addition, there is the problem that some platforms take the long description and cut it short instead of using the short description. *shrugs*
The blurbs tell readers whether or not they want to buy the book. So they also require a lot of tweaking from that point of view.
An example is asking myself “Do I want to make sure I don’t put progressives off by describing myself as a feminist (which I am) or is it more important not to repel more conservative readers by describing myself as a feminist?”
Another one is “Is an academic-sounding description better than a snappier, lighter one?”
Plus, you usually have to select a photo of yourself as well. Which one to pick?!
It is a learning process. By doing, I am slowly getting better at it. At least, I hope so!