I have a shapefile with polygons. And I have a csv file with points. Now I want to know for each point in which polygon it is situated. Every polygon has a number, so I want to create a file where you can find for each point the number of the polygon it is located in.
First, you need to import the points, and make sure they have the same coordinate system. Then you can use intersect to find out for each point in what polygon it is located. See this topic also. Intersection between points and polygons in QGis