Clip raster using four user-inserted points in QGIS

This brief tutorial explains how to clip a raster (e.g., a Digital Elevation Model) using the coordinates of four points imported from a csv file.
QGIS is an open-source GIS platform and can be downloaded here: qgis.org/en/site/
DISCLAIMER: This is an educational video prepared for training purposes. The end-user is responsible to check the correctness of the final results for any applicative use of the tools/processes/analyses illustrated in the video.