[REQ] An instructive example of trace-function and some example of debugging

[bolega <gnuist006@gmail.com>]

An instructive example of trace-function and some example of
debugging, for example, some of the error that pops up in lower window
of emacs and how to read/interpret it. Alternatively, a link to some
page or elisp manual but I am sure an expert here would have a
superior instruction as many replies here have shown.

Thanks
Bolega

trace-function is an interactive autoloaded Lisp function in `trace'.
[Arg list not available until function definition is loaded.]

Traces FUNCTION with trace output going to BUFFER.
For every call of FUNCTION Lisp-style trace messages that display
argument
and return values will be inserted into BUFFER. This function
generates the
trace advice for FUNCTION and activates it together with any other
advice
there might be!! The trace BUFFER will popup whenever FUNCTION is
called.
Do not use this to trace functions that switch buffers or do any other
display oriented stuff, use `trace-function-background' instead.