The builtin Iguana Excel repository contains example channels that demonstrate modules used to transfer data to/from Microsoft Excel spreadsheets. This repository is a little different as it uses examples with two channels working together in tandem, as opposed to other repos where channels are usually standalone.
Simply import the channels that you are interested in, review the comments in the code, and read the corresponding article in this section of the documentation.
You can also view the repository on GitHub: https://github.com/interfaceware/iguana-excel.
Be sure to come back and review this section as we will continue to add examples when new modules are developed.