> I'd like to learn more, can you go into more detail on the usage of let and how one would go without it?
Welcome to the wonderful world of Lisp.
I'd recommend to you to install Portacle (the Portable Common Lisp Environment), this allows you to code in Lisp straight away.
As for tutorials, "Practical Common Lisp" (free online book) is fun, modern, and excellent for introducing you to most CL concepts, including of course use of let, let*, etc.
Welcome to the wonderful world of Lisp.
I'd recommend to you to install Portacle (the Portable Common Lisp Environment), this allows you to code in Lisp straight away.
As for tutorials, "Practical Common Lisp" (free online book) is fun, modern, and excellent for introducing you to most CL concepts, including of course use of let, let*, etc.