This answer quotes ChatGPT
If you have successfully installed Vue and have opened a Vue project in VSCode, you can follow these steps to write code in your project:
1. Open your Vue project folder in VSCode.
2. Locate the vue component file you want to edit(usually suffix.vue) and double-click to open it.
3. In the open file, you will see three sections: template, script, and style.
4. In templates, you can use HTML and Vue template syntax to define the appearance and behavior of components.
6. In Styles, you can use CSS to define the appearance and style of components.
If your VSCode does not display the Vue button in the lower left corner, you can manually start the development server by following these steps:
1. Open the Terminal.
2. Navigate to your Vue project folder in the terminal.
3. run the npm run serve command.
4. The development server will start locally, and you can view your application in a browser.
After you start the development server, you can open your Vue component file in VSCode and start editing the code.