Astra is the most customizable Wordpress theme that is available right now. Not only it is rich in features, but it is also very lightweight and fast loading. You need to install the free version of the theme before installing the Astra pro plugin.
You can use Astra Pro to extend the functionality of the theme to a completely new level. It has seamless integration with other popular plugins like Beaver Builder, Elementor Pro, etc. You need to install the free version of the theme before installing the Astra Pro plugin.