The most straight forward answer is;
Create original content, not found anywhere on the internet, but on one place only.
Know your subject you are writing very well. Be knowledgeable, do extensive research, ask people questions, or work form your own experiences.
Do not copy any others work.
Do not spam.
Always check your grammar, punctuation and spelling. Rewrite all of it if necessary, you do not need to write, publish, then rewrite. If you must rewrite 10 times, then publish.
Write in a manner that is based on understanding, logic and flows very well. Always hard to read if the information rambles, goes into different subjects from the title, or is non nonsensical information.