The Hitchhiker’s Guide to AutoCAD is a great place to get started. And it doesn’t matter if you just completed your initial AutoCAD training, or if you just need to refresh your memory if you use AutoCAD only occasionally.
Since the guide focuses on the most essential tools for 2D drafting and design, what you learn applies to both AutoCAD and AutoCAD LT. The included commands are grouped together according to types of activity, and are arranged to follow a general workflow.
Some of the basics include:
A more extensive list of commands can be found here.