The URL for module 3 exercise 1 refers to exercise 2
https://giscience.github.io/gis-training-resource-center/content/Modul_3/en_qgis_digitalisation_ex2.html
The URL for module 3 exercise 2 refers to exercise 1
https://giscience.github.io/gis-training-resource-center/content/Modul_3/en_qgis_classification_ex1.html
The URL for module 3 exercise 1 refers to exercise 2
https://giscience.github.io/gis-training-resource-center/content/Modul_3/en_qgis_digitalisation_
ex2
.html
The URL for module 3 exercise 2 refers to exercise 1
https://giscience.github.io/gis-training-resource-center/content/Modul_3/en_qgis_classification_
ex1
.html