Good article so far! Some points that can be adjusted.
[x] Change Heading 1 back to# Geodata Concept
[x] Add heading 2 to # Projections
[x] Start with a statement of why projections are important in practical work with QGIS. Something like "If we don't make sure that the projections and EPSG codes are set correctly, we will produce wrong results!
[x] Split the article into two parts. One theory and one particle
[x] I added the presentation on Projections and geodata from HeiGIT to the QGIS Training MaterialPage . You can use this as well.
[ ] Explain, in general, that geographical CRS is used for very large maps like world maps and projected for smaller scales like countries or regions. The best to use on smaller scales is UTM.
Explain how to find the right UTM Zone for an area. There is the website https://epsg.io/ which is used for this purpose. Here you can work with a nice example
Good article so far! Some points that can be adjusted.
# Geodata Concept# ProjectionsHere are some more nice resources
Alec will take care of the Wiki page, so you can link there too.