To have a talk about On Lisp (by Paul Graham) and teach how to use macro in Common Lisp

I learned the basic syntax of Common Lisp, and now I'm reading On Lisp by Paul Graham. The link of the book is here. [login to view URL] I'd like to have a talk about how to write a macro in Common Lisp. The book consists of 25 chapters, and we will have talks 25 times at most. In the talk, we will discuss some macros that I cannot understand. I will pay the tuition after every session. I'd appreciate your help.