This article describes building an environment for annotating IIIF images using Omeka Classic and the IIIF Toolkit plugin. It also covers the basic installation of Omeka Classic.
I created two types of documentation: a summary article on Hatena Blog and a book on Zenn.
Zenn
https://zenn.dev/nakamura196/books/2a0aa162dcd0eb
Hatena Blog
https://nakamura196.hatenablog.com/entry/2022/03/22/234917
I hope this is helpful for learning how to use Omeka.net (Classic).