Make the story even more realistic for the reader, but how?

Your own laws remain true: Especially when science is fiction or fantasy stories, natural laws are often changed. There are magic or technologies that do not exist in the real world. You should always define for yourself and from a certain point also clearly for the reader what is possible in your world and where about the border is. Known works such as Harry Potter or Lord of the Rings also try to bring the world closer to the reader slowly and to roughly define their rules and possibilities, this balance is then normally maintained.

Plot Holes or avoid logic errors: While you work on a story, I would always work with a time ray, plug letters and, if necessary, a card and constantly update it. This avoids that characters come from one place to the other in unrealistic time, that important experiences or skills are overlooked, and you keep an overview of the whole process, because the story you write is always only a small part, but as an author you have to think about the background and have virtually your whole world in mind, you should be aware of what characters could do right now, even if they are not described in the book right now.

Deep-green characters: To write good characters and dialogues, it is best to get really many thoughts about the characters. As already said, you have to have more in mind than just what you write. Even if it’s just about small secondary characters, you should take the time and define it as exactly as possible (with a plug letter, etc.). Define also seemingly unimportant things and not only consider your characters as a means for purpose. Maybe your character is just a simple thief that overthrows the main character, says 2 sentences and then dies, of course you can leave, but for example you can also go deeper into detail, for example by soaking his dagger with a special poison, which could already point to a later opponent who produces this poison and whose craving was the thief etc. I always think about almost any character, no matter how unimportant he seems, his prehistory and certain traits. for example, where is he good, what is he afraid of, what does he like, and above all, why is this all so? Even though it is often not directly recognizable when you make such thoughts, his characters become more alive and that also gets the reader, for the main characters, of course, anyway. It creates deep and understanding, it explains why, for example, the evil character is evil and why the good good and what led to it. As I said, the reader does not have to know everything, but you as an author should always be aware of it.

Sufficient research: When you write about a topic, you should always inform yourself about it so that history is credible. For example, if you write a criminal, you should know how the police typically proceed and what options they have or how criminal organizations and similar networks can run in a rough way. Even though it might be in a fictional city with fictional rules, everything should be rough according to the well-known pattern so that the reader feels better in history. Even though many things are overshot, which is also quite okay, most stories are at least roughly based on this scheme.

Real templates: Similar to the last point, real templates are very important to make a story more credible. Even if the action can of course be conceived, it can and should gradually use real inspiration. For example, if there is an evil regime or a dictator in your history, you can naturally stage it in a similar way as the Third Reich has done, which will probably trigger a depressing mood for the reader. A good example of this is the Empire in Star Wars (color choice/uniforms/architecture/recording)