One thing you may run into is data that isn't georeferenced (term often used for raster data) which means the coordinates are raw cell counts. Or data is georeferenced but is missing the coordinate reference system (aka coordinate system aka projection) information. https://gis.stackexchange.com handles a lot of questions related to 'why doesn't my data line up?' I'm not going to be any good at how to do stuff in QGIS because I haven't used it.
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Imagery/raster data, of course.
One thing you may run into is data that isn't georeferenced (term often used for raster data) which means the coordinates are raw cell counts. Or data is georeferenced but is missing the coordinate reference system (aka coordinate system aka projection) information. https://gis.stackexchange.com handles a lot of questions related to 'why doesn't my data line up?' I'm not going to be any good at how to do stuff in QGIS because I haven't used it.