Digital platforms have a learning curve and can quickly become confusing. This is why it is important to know where you look for support and directions. Omeka provides an extensive user manual that documents each stage of using Omeka from installation, uploading content, and using plugins. If you have a question that goes beyond what the user manual offers, Omeka provides a user forum that is quite active. You can search through the threads to see if someone else already asked a similar question. If not, then you can post your query to the forum and see if the Omeka developers or avid users respond and provide assistance.
Outside of the resources listed above, a number of users have created tutorials, videos, and guides for using Omeka Classic. Some of these were created to supplement classroom lectures or conference workshops.
Omeka Screencasts, Omeka Dev Team
Getting Started with Omeka: A Tutorial, Hanna Frey & Kimberly Arleth, 2016
Installing Omeka, Jonathan Reeve, 2016
Creating an Omeka Exhibit, Miriam Posner & Megan Brett, 2016
Getting Started With Omeka, Sarah Clayton, 2018