Clamps Overview

It is beyond the scope of this reference to give a detailed introduction into all debugging and inspection options in a mature Common Lisp environment like Emacs/Sly/sbcl.

Studying the Sly User Manual is a valuable resource, especially the chapter on Tracing and Stickers.

Also an excellent online collection of tools and information can be found in the Debugging chapter of the Common Lisp Cookbook.

Studying both resources is strongly recommended.