React components go through a lifecycle of events, from creation to destruction. Understanding these lifecycle phases and their associated methods (for class components) or Hooks (for function components) is crucial for managing side effects, state, and performance.

For Class Components, the lifecycle is broadly divided into:

• Mounting: When an instance of a component is being created and inserted into the DOM. Key methods: `constructor()`, `static getDerivedStateFromProps()`, `render()`, and `componentDidMount()`.
• Updating: When a component is being re-rendered as a result of changes to either its props or state. Key methods: `static getDerivedStateFromProps()`, `shouldComponentUpdate()`, `render()`, `getSnapshotBeforeUpdate()`, and `componentDidUpdate()`.
• Unmounting: When a component is being removed from the DOM. Key method: `componentWillUnmount()`.
• Error Handling: When there is an error during rendering, in a lifecycle method, or in the constructor of any child component. Key methods: `static getDerivedStateFromError()` and `componentDidCatch()`.

For Function Components with Hooks, the `useEffect` Hook is primarily used to handle side effects that would traditionally be managed by lifecycle methods like `componentDidMount`, `componentDidUpdate`, and `componentWillUnmount`.