what is reactjs
A JavaScript library for building user interfaces
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React Cards
reactstrap Easy to use React Bootstrap 4 components
What is Gatsby
Gatsby is an open-source static website generator (SSG) that is based on the frontend development framework React and makes use of Webpack and GraphQL technology. It can be used to build static sites that are progressive web apps, follow the latest web standards, and optimized for speed and security.
Scss
Sass is the most mature, stable, and powerful professional grade CSS extension language in the world.