Vue Basics: A Comprehensive Guide to Vue 3 Directives

Vue 3 directives are special HTML attributes prefixed with `v-` that add reactive behavior to DOM elements. The guide covers essential built-in directives like `v-bind` for attribute binding, `v-model` for two-way data binding, `v-if`/`v-show` for conditional rendering, `v-for` for list rendering, and `v-on` for event handling. It explains directive syntax including arguments and modifiers, demonstrates how to create custom directives with lifecycle hooks, and provides best practices like using unique keys in loops and choosing between `v-if` and `v-show` based on toggle frequency. A practical todo app example shows multiple directives working together.