Hi guys...
I am about 2/3'rds of the way thru this course.
They send you a pretty good book for free.
You read a chapter ...take a test. If you fail you can retake it.
You read a chapter ...take a test.
You read a chapter ...take a test.
You read a chapter ...take a test.
Repeat.... spin.... dry... you get the idea.
NO cost.
And I'm learning a LOT.
The book is easy to read,(LOTS of pictures!). Covers machining of most all types. They give you 6 months to complete the course.
There is some "advertising" in that they feature their products, but it is not unreasonable or out of line considering the price.
Be well!
Glenn