Best Tips on Writing a Book

This and any of the cliches do work if executed well. Thing is tons of stories have this but it's just a click away if you prefer to not read stories with mary sues on it.

ESPECIALLY the main protagonist. Perfect main characters always make the story a little more boring for me. Character flaws are great

These are annoying.

Different characters can be pretty good too.

Don't make them stay the same.

This is so important

Good, believable and unique characterisation is more important than the narrative. The narrative is life equivalent and what is life without unique individuals to fill the pages of life?

Good point! Villains are human too. They have to have a soft side too. They have to have reasoning for what makes them tick.
The villain is the most complex character to write; a believable one must have all sides of their personality shown through writing. As with all characters "show, not tell" is a great rule. It's the most fun to write the villain but if the character isn't believable, the reader won't relate, get bored and shut the book forever.

It's really hard in some cases, especially god-like entities. However, put emotion into them, and your audience will feel that.

Villain is the base plot of a story. You can have a story but you need a cast that will the other side of the coin.

The worst clichés in stories are the ones with twist endings. Usually: the story has all been a dream or the main character turns out to be a ghost. These endings have been written to death! It's time to give them a suitable burial and come up with creative new ideas.
Also a big cliché is making a working class character as unintelligent or a well-spoken character intelligent. It's predictable and boring.

Especially when writing red-herrings. The reader will pick up on it straightaway.
Sub plots with minor characters take the reader from the main action. But sub plots shouldn't be used too often. It confuses and distracts the reader and dilutes the story.

Yeah like in the Loud House they focus on other Characters sometimes not just Lincoln.

In other words, proofread your work. You may leave grammar or spelling mistakes from time to time, especially when writing a long novel. Nobody really wants to write a poorly written book with improper punctuation and spelling, even despite if the story plot sounds intriguing. It may be repetitive for you as an author, but it's generally worth it if you want to publish your book. A properly written book much better to read. A good tip is that you read the sentences out loud you've written in that book. If the punctuation sounds off, better to change it.

This is especially important for newer authors and experienced authors alike; you will also need the mindset of discovering things including certain topics you don't like, and that makes you sound like a more genuine person as well as your story. Not only you will discover new ideas but you will also be able to tackle different topics, paint diverse themes, portray different character personalities as you apply your diverse knowledge into your story.

Me in a nutshell.

This tip tends to be overly thrown around to newer writers. It's a good tip but I think it needs to be said better. My take in for this advice is that you don't always need to show. Sometimes balancing it is a key to make the story good. Even great authors use a lot of telling in their stories. Think it this way: when you want to either speed up the pace of a story, you use more telling than showing. If you want to slow down the pace of the story, while keeping a reader engaged, use showing. Showing too much may disengage the author from your story as they may find the pacing too slow. But it's all a combination of balance and the right time.

Yes, that is the art of writing; it's like being an artist except you use words to paint the scenes. While this is good generic advice, I'd recommend you'd not follow this method as always. In my opinion it's best to balance it. In some circumstances you have to tell stuff because readers would be overstimulated with information, e.g you'd use telling if you want a quicker method to move scenes and events in a more concise manner.

I think this is one of the most important tips to consider as a writer. People would just roll their eyes out when they see a sentence like "I lengthily gazed at the meticulously detailed watchtower with fixed admiration, surrounded by the opaque yet magical clouds within the gleamy, striking atmosphere"

It's usually better making sentences that can be imaginable by readers as possible, not putting out unnecessarily long sentences that would easily overload readers.

Mostly meaning putting in fitting words and snappy dialogue. Remove as much details and adjectives/adverbs you think is unnecessary as possible. If you want to catch the attention of readers just don't make your sentence too flowery. This is what many authors, especially beginners tend to struggle.