I'm not sure about the help file, but a list of common error/mistakes to help beginners. I made these mistakes, the first people I taught lisp made the mistakes, Autodesk made these same mistakes in commands and express tools
When using (command "pedit" ... check the status of peditaccept system variable
When using (ssget "x" ... did you mean to include objects in paperspace
When passing a point to a (command ... do you mean to use osnaps
Could end up being quite a long list, could probably be a thread on its own.
Cheers, Rod