http://www.wolfram.com/training/courses/mathematica/ lists free and for-pay videos.

Introductory pages in the online/in-product documentation are not as obvious as they used to be. I suggest starting with Help menu - Wolfram Documentation or http://reference.wolfram.com/language/ and starting at the beginning with Core Language & Structure.

Pick a sub-topic, for example, Language Overview, click it, and in the upper-right corner choose a tutorial.

Bill,

Thanks for your quick and detailed response.

Wow, Stunning result.

You mean to say that to understand the basics of this Mathematica I should by an old, out-of-print, and outdated book. There is no other means? Video Tutorial? On-line tutorial?

Crashing should cause someone some concern.

Finally, if the point of Mathematica is to do the math for up (speed and accuracy) then why use /. ->. I can use cut/copy and paste also. For that mater, why not just use paper.

Is there a way to get the program to re-evaluate the notebook from scratch? Can I get rid of eq1? Seems if I delete the cell, eq1 persists. If I try to correct the line, it causes errors. (Replace "==" with "="). So what's on the page (notebook) does not correspond with what's going on in the background??

Any other thoughts?