If you've received a QGIS project from someone else (or you've changed the location of some files) you may get the "handle bad layers" pop up. This video will show you how to fix it.
Our QGIS course on Udemy (you can get 50% off with this link) has a lot of students now and I've fielded a few questions on bad layers. So I hope this answers any questions you might have. Don't forget to subscribe to the Youtube channel for more GIS tips and tricks ;)
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