How can you install Vue.js in your project?

You can install Vue.js in your project by using the following 4 methods:
 
* Yu can use CDN by including <script> tag in HTML file.
* You can install Vue.js by using Node Package Manager (NPM).
* You can install Vue.js using Bower.
* You can also use Vue-cli to setup your project.

CDN :  For prototyping or learning purposes, you can use the latest version with:
<script src="https://cdn.jsdelivr.net/npm/vue@2.7.0/dist/vue.js"></script>
For production, we recommend linking to a specific version number and build to avoid unexpected breakage from newer versions:
<script src="https://cdn.jsdelivr.net/npm/vue@2.7.0"></script>
If you are using native ES Modules, there is also an ES Modules compatible build:
<script type="module">
  import Vue from 'https://cdn.jsdelivr.net/npm/vue@2.7.0/dist/vue.esm.browser.js'
</script>
You can browse the source of the NPM package at cdn.jsdelivr.net/npm/vue.
 
Vue is also available on unpkg and cdnjs (cdnjs takes some time to sync so the latest release may not be available yet).
 
Make sure to read about the different builds of Vue and use the production
version in your published site, replacing vue.js with vue.min.js. This is a smaller build optimized for speed instead of development experience.
 
NPM : NPM is the recommended installation method when building large scale applications with Vue. It pairs nicely with module bundlers such as Webpack or Browserify. Vue also provides accompanying tools for authoring Single File Components.
# latest stable
$ npm install vue
CLI : Vue provides an official CLI for quickly scaffolding ambitious Single Page Applications. It provides batteries-included build setups for a modern frontend workflow. It takes only a few minutes to get up and running with hot-reload, lint-on-save, and production-ready builds. See the Vue CLI docs for more details.

Source : v2.vuejs.org