GitHub has become the place for people to share source code for all sorts of open-source applications ranging from simple single-file Arduino sketches to huge cloud applications consisting of thousands of files, but also other things like electronics design files or simply text documents.
Elektor ESP32 Weather Station Kit: https://www.elektor.com/esp32-weather-station-bundle-kit-outdoor-unit
Elektor ESP32 Weather Station at Elektor Labs: https://www.elektormagazine.com/labs/esp32-weather-station-180468
Elektor ESP32 Weather Station at GitHub: https://github.com/ElektorLabs/180468-ESP32-Weatherstation
If you prefer reading: https://www.elektormagazine.com/labs/github-for-dummies
Follow me on Twitter: @Clemens_Elektor