An IIIF Manifest is nothing more than a json file with a specific structure. Each time you Add a Resource to Mirador for example, you are telling Mirador which JSON file to use as a manifest.
# Manifest Structure
An IIIF Manifest can have a large number of key/values. We shall only go over the most important ones here. We suggest reading the [IIIF Presentation API](https://iiif.io/api/presentation/3.0/) for full documentation about a Manifest's structure.