FDM building blocks
https://bausteine-fdm.de/index

Introduction to YAML
https://learn.getgrav.org/15/advanced/yaml

Folder Structure Analysis with Python
https://janakiev.com/blog/python-filesystem-analysis/

Store QGIS cache on a fast disk (and not on our server!)
https://courses.neteler.org/gaining-wms-speed-enabling-qgis-cache-directory/