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When I'm adding a Virtual Layer to a project using QGIS 3.12.2, it cannot be toggled to edit mode. That is: the pencil icon is grey coloured. This can be said for layers created either by the Create Virtual Layer or the DB Manager SQL query.
Is it possible to edit a Virtual Layer? If so, how can it be done? If not, is there any documentation or reference regarding this aspect?
No, you can not edit a virtual layer this way. This is because a virtual layer is just a query on other layers. So you either need to edit the layers the virtual layer is based on, or save the virtual layer as a "static" file - once you have done this, you can edit that no-longer-virtual-layer.
You can only edit the query of this virtual layer.
To complete the other answer
If you edit the source layer the virtual layer should update. If you use a database as a source you may create an editable view (see this question for exemple) but keep in mind that you are still modifying the original data and not only the view.
