What are shrinkage cracks or small marks in interior plaster

As the title says, which filler do I use to repair settlement cracks and small damages in the interior plaster? The interior plaster is Q3 and simply painted white. Should I use a filler and surface filler or UNIFLOTT FINISH

First Tiefengrund and then Uniflott. That's how it's done!

If it is already painted there, you don't need a primer. I claim you can use both. Some kind of gypsum filler also works.