This has some good stuff in it. Some of these were work flow changers for me.

http://cadintentions.com/10-secret-autocad-commands/

Create and modify

Tip 1. How to: Create an Arc with Specific Length

Everybody knows how to create an arc in AutoCAD. If you need to draw an arc with specific length, do you know how to do it?

Tip 2. Align Tool: Move, Rotate, and Scale Your Object at Once

Align is often overlooked by many AutoCAD users. Instead of using move, rotate, and scale separately, you can do it at once using this tool.

As Robin Capper said, it’s a forgotten AutoCAD hero!

Tip 3. How to Control Linetype Scale

We use linetype to control the object appearances. It can be dashdot for center lines, dashed lines for hidden lines, etc. Sometimes we have a hard time to control the linetype scale. And we can’t see the linetype as we expected. It is not that difficult actually.

Tip 4. 10+ Ways to Select Objects in AutoCAD

When you use modifying tools, you need to select objects. Selecting objects sometimes can be tricky, especially in quite a complex drawing. This tip have 10 ways how you can use the object selection. Useful for beginners, and some methods might be missed by advanced users.

Tip 5. How to: Create Angular Dimension Larger than 180 degrees

Do you need to create an angular dimension that shows angle larger than 180 degrees like below? You probably have found that you can’t create dimension with angle larger than 180 degrees after selecting

To know little more about cad cam you can go through this: cad cam blogs

Less about the technical stuff of AutoCAD and more about keeping an efficient workflow:

Make a template file with all the linetypes, colors, repeating blocks, etc. to speed up any future drafting project. It takes a while to setup and certainly asks for a lot of patience, but it’s all worth it when all you need to do after is just MATCHPROP and copy-paste.