In this article, we assume that you know the basics of Vue 3. In the cited article, the main changes from Vue 2 to Vue 3 are explained, as is the basis for understanding how the composition API functions. The latter would be the main topic of this article: the Vue 3 Composition API.
Vue 3 Composition APIs
The change from Vue 2 to Vue 3 offers several options to developers when assembling the logic of a component. We can continue using the Options API as we were doing in Vue 2 or use the Composition API.