NiceBird Child Theme: Child Theme can be used for further customization of the theme. The modifications can be lost in case you perform them directly on the theme. Child theme preserves the modifications.
NiceBird Theme documentation: The documentation file provided with the package contains step by step guide to set up the theme. It does not have to be uploaded to the website.
Visual Composer: It is one of the plugins that are offered additionally to the users. In the event of an update, it can be downloaded and installed on the website through FTP. The plugin cannot be updated from the back-end as the users are not provided with the license key.
Uploads: Uploads folder consists of the images that are uploaded for the theme as well as the images corresponding to the plugins.