TailwindCSS is a low-level utility first CSS framework. It's unlike other CSS frameworks. It gives you a whole lot of power and flexibility with its utility classes which let you build your own components.
With the repo, it easier to start out your projects with TailwindCSS, you can start by cloning the repository, or downloading the folder.
You can also configure your default styles in the tailwindcss-config.js,This documentation explains how to configure the file.
To get more information about TailwindCSS-Checkout the documentation, It's well documented and easy to understand.