I am wondering what I would need to do in order to import a CSV file and then combined that with an existing layer.
I would like to know which boxes I need to check in order to make this combine with another layer.
If you could also walk me through the step by step procedures if we need to write any expressions in the field calculator that would be great.
If it helps I downloaded the original Layer with all the Data points on it and then Added a field and would like to re-add it into QGIS.