In the Assets overview you can search and navigate through all of your root assets (such as domains and IP addresses).
From here you can also choose to remove your root asset. Please note that removing the root asset means that all the associated data and settings will be removed permanently as well:
By clicking on the asset, you will receive data about its subdomains and scan profiles. This is great for getting an overview of your current security landscape.
More information about each particular tab is available in our Working with Assets article.