Jekyll will look into the _data directory.

Working with yml files is as easy as adding a file in this directory, and Jekyll will expose its contents on the[YML_FILE_NAME].

In this example, rendering a list of authors listed in a YML file is as easy as:

\{\%\- for authors in limit:8 \-\%\}
  \{\{ \}\}
\{\%\- endfor \-\%\}

The related Data file is located in _data/authors.yml with the following contents:

name: Christian
username: christian
name: admin
username: admin