Hello and welcome back.
With regards to the title of this post that your story must be accurate. This is generally regarding if you are writing about specific professions or locations. As an example it is important to know that if you are writing a scene in which police are interrogating a suspect how they would conduct the interview. If the police character starts abusing the suspect, it’s not an accurate account of what would happen. I remember taking a course on police interrogation on Udemy and the instructor of the course said every cop who ever sees a TV show or reads a book in which that happens stops watching or reading right then and there.
If there is anything about a specific profession that is wrong you’ll likely lose readers.
If aspects of your location are not accurate, people from that area will likely call you out on it in reviews and other places.
Research is the key to making your story as accurate as possible. These days there’s simply no excuse for inaccuracies. That’s what Google and other search engines are for.
You can also search interest groups on social media and ask the members questions to make sure you get things right.
Of course you can always make up a profession or set your story in a fictional town or city. But if you are writing a series you will need to keep the story accurate within the series. Such as in book one of the series the main police station is on Brown Street and then on book two it’s on Green Street.
Anyway, I hope this helps.