I'm not aware of any step by step courses but if your persistent, ask questions and work your way through tutorial videos you'll pick it up quickly.
Have you upgraded to a more recent version of Alibre?
If you'll browse through the Tutorials and Tips subforum, you'll find lots of tutorial videos. That will help you get started.
Whenever you run into trouble, this forum is a great place for help
Tips, tricks, and tutorials made by the Alibre community. This forum is only for start-to-finish lessons on any topic you choose.
www.alibre.com
Also, there is a list of links to Alibre Atom tutorials for beginners here. Atom is cut down, lacking alot of convenience tools, so learning to do things the "Atom" way, is a good training tool.
The Hobby Level Alibre Atom3D trial download can be found here: https://www.alibre.com/get-a-trial-of-alibre-atom3d/ The Professional level $$$, Alibre Design trial download can be found here: https://www.alibre.com/get-a-trial-of-alibre-design-expert/ Here is a list of tutorials to...
www.hobby-machinist.com