1. HTML HTML is all about content markup language and is a back bone for 99.99% websites. It's mandatory to have a good skill of HTML before diving in to other technologies.

2. CSS CSS is for making our content created in HTML more attractive for human vision. CSS is all about design.

3. JavaScript JavaScript is all about behavior. We apply JavaScript for our website to have it's own behavior.

4. React React is created by Facebook as an open source for creating an interactive and fast web application.

5. AWS Amazon web service is used for hosting web applications in to the cloud.

Thanks for reading!