update README

Author: alexlobera

README.md

@@ -65,11 +65,11 @@ The goal of this exercise is to understand what's state and how to reason about
 ## 🤸‍♀️ Exercise
 
 - [ ] 1. Refactor the “about” and “footer” sections by creating a function component for each.
-      Make sure everything works.
+      Make sure everything works. Hint, you can look at the `src/components/Header.js` as an example.
 
 - [ ] 2. Refactor the navbar by creating a Function Component.
       Pass the dependencies (`toggleMenu` in this case) via props.
-      Make sure everything works by clicking on the "Training" button at the top right of the screen.
+      Make sure everything works by clicking on the "Training" button at the top right of the screen. Hint, you can look at the `src/components/Header.js` as an example (heads up, use curly brackets to pass a prop as a function)
 
 - [ ] 3. Refactor the books section by creating a function component and pass the dependencies via props.
       Make sure everything works.
@@ -80,6 +80,7 @@ The goal of this exercise is to understand what's state and how to reason about
 - [ ] 5. Break `<Books>` down into `<BookList>` and `<BookFilter>`
 
 ## 🏋️‍♀️ Bonus exercise
+
 - What do you think it would make sense to componentize next? Are there any parts on that view that you can reuse? Hint, replace the `<a>` with your `<Link>` component. Who are the children of the `Link` component? The `Link` component should receive a prop called `to` that becomes the href of the `<a href={to} ...`. Try to use the prop called `children` for the text displayed inside the anchor.
 - Can we move the `isMenuOpen` state inside the menu? Does it conflict with the idea of "lifting the state up".
 - If you look at the [React Profiler](https://reactjs.org/blog/2018/09/10/introducing-the-react-profiler.html) when you open and close the menu, is the whole app being rendered? If so, how can we avoid that and still lift the state up?
@@ -92,7 +93,7 @@ The goal of this exercise is to understand what's state and how to reason about
 - Basic React course from [freeCodeCamp](https://learn.freecodecamp.org/front-end-libraries/react/)
 - [https://reactjs.org/docs/lifting-state-up.html](https://reactjs.org/docs/lifting-state-up.html)
 - [https://reactjs.org/docs/thinking-in-react.html](https://reactjs.org/docs/thinking-in-react.html)
-- [babel repl example](https://babeljs.io/repl#?babili=false&browsers=&build=&builtIns=false&spec=false&loose=false&code_lz=JYWwDg9gTgLgBAJQKYEMDG8BmUIjgIilQ3wCg0IA7AZ3gAkkAbRiAYV0kqUvgF44AFAEo4vAHwEAFsHwBuUqQA8AE2AA3OGkYpq1AHIoQSXvgo8UwLlHxjScOCvWbtug0ZM4A7jbv24AbwZmNg4qbhgAX19FAHpVNVtY-LEgA&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=true&fileSize=false&timeTravel=false&sourceType=module&lineWrap=false&presets=es2015,es2016,es2017,react,stage-2&prettier=false&targets=&version=7.3.3)
+- [babel repl example](https://babeljs.io/repl#?babili=false&browsers=&build=&builtIns=false&spec=false&loose=false&code_lz=JYWwDg9gTgLgBAJQKYEMDG8B UIjgIilQ3wCg0IA7AZ3gAkkAbRiAYV0kqUvgF44AFAEo4vAHwEAFsHwBuUqQA8AE2AA3OGkYpq1AHIoQSXvgo8UwLlHxjScOCvWbtug0ZM4A7jbv24AbwZmNg4qbhgAX19FAHpVNVtY-LEgA&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=true&fileSize=false&timeTravel=false&sourceType=module&lineWrap=false&presets=es2015,es2016,es2017,react,stage-2&prettier=false&targets=&version=7.3.3)
 
 
 ## License