Display a view in search results
The Search API supports views out of the box.  You just need to create a new view and select the "Index" you want to search.  E.g. Index Full Site or Index Resources.  These match the indices you have created in the Search API setup.

This will let you get any 'fields' in the index and use some Search API specific filters (e.g. Fulltext search which looks across all index fields.).

There are some options that refer to Datasource information.  This is the way you can take information from the index and related it to the full node.  Depending on your needs, you may need to use Relationships to get to other items, e.g files or images.

There are a fair number of tutorials on this, just search for them.