How to add wms to QGIS / Using Web Services in QGIS

How to add wms to #QGIS:
In QGIS, click the "Add WMS/WMTS Layer" button in the 'Layers' toolbar. From the dialog select the 'New' button. Enter a name for the connection and the service's WMS URL, then click 'OK'. Click the 'Connect' button, to fetch the details of the WMS service.
How do I add WMS to GeoServer in QGIS,
What is a WMS layer in QGIS,
How do I create a WMS layer,
How do I add Sentinel hub to QGIS,

[@p4puslive]

Make a video on how to extract parts of orthofotomaps FROM (!) WMS/WMTS layers (!), because that'd be interesting thing that many people don't know how to do.