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I would like to create a few thousand points by clicking on specific points in my background map. I have created a shapefile-layer for this task. But when I click on the map, QGIS always asks for a point ID. Is it possible to give these points an ID automatically so I don't have to type one? Do the points need an ID? If I just click enter, the point is saved without an ID. Is that a problem?

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You can use the attribute form tab of the layer properties to set a default value for newly generated features (where the red text is in the old screenshot I attached). If you enter $id there, every new feature will be assigned a unique ID upon creation.

And no, unless you're working with geopackages, your features don't need an ID.

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Alternatively you may disable the attribute form when creating new features in the digitizing tab in the options.

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It's not per se a problem, if you don't enter an ID, since your location is still a unique identifier. But of course this would be bad style and could get you into problems in the workflow later on. So an unique ID is almost certainly a must.

But your question has been answered previously, and extensively. In my opinion the most straight forward way would be using the 'Attributes Form' in the layer properties, explained e.g. here: https://gis.stackexchange.com/a/312406/176374

If I missunderstand your question and you have a different need please correct me.

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