Options API => Composition API: Lifecycle Options API | Composition API beforeCreate, create | Not Needed | (setup replaces thes hooks) beforeMount, mounted | onBeforeMount, onMounted beforeUpdate, update | onBeforeUpdate, onUpdated beforeUnmount, unmounted | onBeforeUnMount, onUnmounted

Options API => Composition API Options API | Composition API data() {...} | ref(), reactive() methods: {doSmth() {...}} | function doSmth() {...} computed: {val() {...}} | const val = computed() watch: {...} | watch(dep, (val, oldV) => {}) provide: {...} / inject: [] | provide(key, val), inject(key)