I think it's more important to know the movement types and what they mean in an inventory process, than to actually configure new movements. I've worked with the system for 18 years - and have never had occasion to create a new movement type.
The availability check is really SD. This is (at least was) covered in the certification academy. This is i certainly important - because the SAP delivered settings don't make sense in most cases.
Anything you learn about MM will be useful. I would focus more on:
1. Basics of inventory management
2. Purchase requisitions/purchase orders for stock
Next would be some general logistics subjects:
3. Batch management basics
4. Serial numbers
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