what is needed to build good react js projects code example

Example: professional react projects

/* 5 React projects you should build
 
1.Build a Social Media App    https://www.freecodecamp.org/news/content/images/2020/01/social-media-cropped-min.gif
2.Build an E-Commerce App     https://www.freecodecamp.org/news/content/images/2020/01/ecommerce-cropped-min.gif
3.Build an Entertainment App  https://www.freecodecamp.org/news/content/images/2020/01/entertainment-cropped-min.gif 
4.Build a Messaging App       https://www.freecodecamp.org/news/content/images/2020/01/messaging-cropped-min.gif 
5.Build a Productivity App    https://www.freecodecamp.org/news/content/images/2020/01/productivity-cropped-min.gif 

ref : https://www.freecodecamp.org/news/5-react-projects-you-need-in-your-portfolio/ 
 */