Start here:
https://csound.com/get-started.html#your-first-synthesiser

Demo

Sound Design Etude 1: A Six Instrument Orchestra

    wget http://www.csounds.com/chapter1/instruments/01/etudes/etude1.orc
    wget http://www.csounds.com/chapter1/instruments/01/etudes/etude1.sco

Emacs

Emacs mode:
https://github.com/hlolli/csound-mode

Emacs-detected extensions detected by Emacs mode:

    .csd
    .orc
    .sco
    .udo

Emacs Keybindings

C-c C-p csound-play Same as doing csound filename -odac

C-c C-r csound-render Same as doing csound filename -o filename.wav

C-c C-z csound-repl-start

C-M-x/C-c C-c csound-evaluate-region

C-x C-e csound-evaluate-line

C-c C-l csound-repl-interaction-evaluate-last-expression

C-c C-s csound-score-align-block cursor needs to be within a score block

M-. csound-score-find-instr-def cursor needs to be within a score block