Good training for learning Logos is available. I have used some of about everything out there. Yet some of us are self-learners.
Let me clear. I hate manuals. However, I heartily recommend spending time working through Logos Resource Documentation and you will learn an awful lot and may have a good time doing it.
Open your library. Search for something like:
Type:Manual
Title:documentation
You might find more than 60 documents.
Pick a manual such as Factbook Media Database Documentation by Jessica Parks
Note the long list of Resources that are linked to resources in your library.
Even if you don't know much about history, you can still click some links, look at the pictures, and turn the pages.
Try:
Theophanies in the Bible Documentation
Angels, Demons, and Deities: Dataset Documentation
Confessional Documents Cross References: Dataset Documentation
I've been through only about 27 of these documents so far and learned a LOT about my Logos Resources, searching methods, and how Logos works in general.
What documentation have you found most helpful?