Manuals and reference material

Nyquist in the Audacity manual:
https://manual.audacityteam.org/man/nyquist.html

A brief guide to using Nyquist in Audacity:
Nyquist in Audacity (including how to turn Nyquist code into an Audacity plug-in): https://wiki.audacityteam.org/wiki/Nyquist_Plug-ins_Reference

Nyquist reference manual: http://www.cs.cmu.edu/~rbd/doc/nyquist/

Nyquist language reference: http://www.cs.cmu.edu/~rbd/doc/nyquist/indx.html

Nyquist is based on XLisp, which is a dialect of the LISP programming language. There is additional useful information in the XLisp manual:

XLisp manual: https://www.audacity-forum.de/download/edgar/nyquist/nyquist-doc/xlisp/xlisp-index.htm

XLisp language reference (including examples for each command and function): https://www.audacity-forum.de/download/edgar/nyquist/nyquist-doc/xlisp/xlisp-ref/xlisp-ref-index.htm

For any LISP based language, indentation is vital for making the code readable:

Indentation guide: https://style-guide.audionyq.com