To run any of the code samples you’ll find in this course, or anywhere else, you can use the Vue CLI you just learned about, but there are also easier options.
One of the best options is CodeSandbox.
CodeSandbox allows you to use many different frameworks. Vue is one of those. The particular thing about CodeSandbox is that it uses the Vue CLI, and you can create a Vue CLI project right out of the bat from https://codesandbox.io/s/vue, with Single File Components (.vue files) support.
I will use this in many code samples.
Another option is to use JSFiddle. It provides a Vue Boilerplate at https://jsfiddle.net/boilerplate/vue. Contrary to CodeSandbox you can’t use .vue files here, but it’s simpler to test-drive some code. I will use it as well so you can get a good idea of when one is best.