For beginners, Gary Provost's two books: Make Every Word Count and Beyond Style.
Orson Scott Card's Characters and Viewpoint will help you not make mistakes with limited POV.
That's enough to start.
And then take your favorite two novels in your genre as paperback books, and re-read them slowly and make notes on them in these areas, both in the margins, and in reflecting after you've finished a section of the book.
Character: when was this character introduced, and how? In dialog? Description? Was there conflict or was it a calmer scene? Was the sense of that person you came away with upon their introduction proven out in the rest of the book?
Description: how much is described? If a scene is set, count sentences in the description. If a character is, note what exactly and how many words are used.
Dialog: how can you tell who is speaking? What kinds of dialog tags does the author use? How often do they use no tags but some other way to designate who is speaking? Do characters always respond to exactly what the other person said, or do they sometimes change topics?
Chapters: how many pages? How do they begin and end?
(Highlight things that seem a good lesson in all of this, and you might have to read a chapter once for dialog, once for description,a third time for action beats, etc.)
Point of View: if more than one, how does the author signify when s/he is changing POV? How do we know we're in that character's point of view? Is there any point at which a POV character is misinterpreting reality, and how does the author pull that off?
Structure: what is the inciting incident, and where does it come in the book? If you had to pick the four most important moments of the book, what are they and where do they fall? How does it start? How long does it go on after the climactic moment?
Action: how does the author keep straight who is doing what? How long are the sentences? Does the dialog change? If so, how? Circle the verbs in an action scene and see if you can come to any general "rule" of writing (all rules are guidelines).
Contratextual: look at the cover, summary, and quotes/reviews. Do they reflect what's in the book? Do you think they had any sway over why you bought it in the first place? Do you think they had sway over other readers?
Write down everything you learned from the first book, and then write down everything you learned from the second book.
Do that for two books, seriously, taking 1-2 months on each book, a little bit of work and study every day, and in four months you'll know a whole lot more about writing than you know today. It's a far better way to learn than popping into a writer's group and asking "how do I paragraph dialog and action together?" "Can I use 'said' for a whole page?" You'll already know the answers because you did the work of learning on your own, and those lessons will stick with you forever.