See the guideline of licenses policy:
https://spdx.org/licenses/
https://community.kde.org/Policies/Licensing_Policy

Usual usages:

BSD-3       : makefiles, sh, py.
CC-BY-SA-4.0: gif, png, webp, svg, ico.
CC0-1       : yml.
MIT         : html, css, js, php.
GFDL 1.2+   : rst