1. When should use context API?

Answer: Context API used for access data from many components at different nested levels.

2. What is a custom hook?

Answer: Custom hook is a hook that create by us for reuseble data that we will use for many different components and it will reduce code repeat and custom hook name start with use....

3. What is useRef?

Answer: useRef is a react build in hook. it will manipulate DOM directly by using ref attribute for particular element.

4. What is useMemo?

Answer: useMemo hook memorise value on it so that same thing doesn't do every time. that's why application performance and speed boost up.