Start with making rings. It sounds silly, but they’re small so they print fast so you’ll get to learn fast. Plus, people will enjoy them.

Containers is a great next step from rings. They’ll encourage learning about fit, coordinate systems, and support structures.

There's a two or three parter on youtube where some main Autodesk dude makes a widget. It's something like 90 minutes all-in, and that was enough to give me the traction I needed to start experimenting. From there it's re-watch bits as needed, and googling around---mostly ending up at the Fusion 360 help forums.

I used lynda.com myself. In many cities in the USA you can get free access to the site through your local library. I found it easier then searching for a video here and there on youtube.

I’ll look into it. I have pluralsight through work. But I’ll check the library for Lynda.com access.