To write a novel and post it online, you can follow these steps: 1. Decide on the genre and theme of the novel, and conceive the storyline and characters. 2. Start writing. During the writing process, pay attention to maintaining the cohesiveness and logic of the story and try to avoid any grammar and spell errors. 3. Revise and edit the first draft to ensure the quality and fluency of the novel. 4. Choose to publish the novel on different online writing platforms such as Tangyuan Creation, Qidian Chinese Network, etc. 5. Sign up for an account on the platform and upload the main body and outline of the novel for review and publication. After publishing the novel, you must pay attention to maintaining your own account and actively interact with readers to obtain feedback and recommendations to increase the popularity and influence of the novel. 7. Continue to update and write, continuously release new works, and become a popular novel.