Some writing advices are meant to be ignored.
Advices aren't rules. They are simply meant to help writers, and they do help some. They aren't magical spells that work for everybody, everytime. There are times when these so considered "rules" need to be broken.
It's like saying avoid giving your first chapter a different name, because prologues are just the first chapters of your story in disguise.
The difference? Prologues are helpful to include a scene that happens either much later in the story, earlier than the story, or just a scene that the narrator didn't witness/doesn't know about. They keep your reader reading, because the work of a prologue is to set up a hook for the reader. Then what does this advice suggest?
Some writers believe prologues make the story boring or make the reader feel cheated (because it takes place at a different time, location, or different characters) but that is not always true. In fact, there is nothing wrong with having a prologue in your story. Treat it like an introduction to your story, but it's still a part of your story.
I've deleted or avoided prologue scenes in many crafts, only to realise later they were actually a better opening and created a hook for my story.
.✦ ݁˖ 2. Only write in active voice.
You can use active and passive voices as much as you want, no limitations. Active voice is considered better by many writers because it keeps the book fast paced, character centred, and... as the name suggests, active.
But imagine reading a book with only active voice. A lot of writers have different writing style and it doesn't matter what voice they use as long as the writing is clear and understandable.
I myself used to believe active voice was why my writing was feeling plain. It wasn't. Infact, making every sentence active in my draft was perhaps the worst descision I've ever made.
Active voice is suggested a lot for horror, mystery, crime, and other such genres. It keeps them fast paced and direct. But these genres also have various passive sentences in them. Passive sentences focus more on the object, or verb, i.e., what is happening, or to whom/to what it is happening. They reveal the subject in the end.
.✦ ݁˖ 3. Every scene must move the plot forward.
There is no problem with unnesscary scenes. They reveal character, or provide comic relief. Give your readers time to breathe instead of bombarding them with all the action-packed, mysterious or political argument scenes that lead in the direction of the plot.
However, I agree that having too many unnesscary scenes that do not contribute to the plot can lead to the readers slowly abandoning your book. The balance is important, neither extreme is correct.
.✦ ݁˖ 4. Plan everything before starting writing.
This is excellent advice for those who love planning, or depend on it for writing. However, this does not apply to all writers.
I spent months trying to find ways of outlining my book, but I ended up abandoning the technique altogether. I believe I am the kind of writer who prefers to let the story take it's own direction, or likes to move forward with only a rough idea or plot points in mind. You have to find out which path works for you.
If you are the kind of writer that what's to put characters in a room and experiment, you don't need to force yourself to outline.
If you're content with, or work better with only a few planned directions or a rough plot, go ahead. It isn't necessary to know every detail, and spend too much time planning than actually writing.
You need to find your way of writing, not mold yourself into someone else's.
.✦ ݁˖ 5. Read a lot to become a better writer.
You don't need to read a lot in order to write stories. Reading (especially your specific genre) helps you understand the way other authors write, analyse the structure, elements and characters, and even gain inspiration. However, reading is a hobby for the purpose of enjoyment so forcing yourself to read and analyse every detail in a story isn't really important.
I, as a writer, only read because I enjoy reading. Even though sometimes I do learn something from authors and their writing styles, my sole purpose isn't to make my writing better. I sometimes read different genres than I write. I sometimes don't read at all for months.
So believing that you can't be a writer without being a verocious reader is very false. You can read now and then, as much as you prefer, without needing to do it a lot.
And, that's the end. Hope this helped, because as a first time writer I remember following every advice, trying to make my writing better. Some helped. Some didn't.
And that's ok. Because every writer is different. That's why every story is uniquely beautiful. You don't need to worry because some advices don't work for you. You don't need to force yourself to become the "perfect writer".
And remember, there are no rules to writing.