Network sockets - anything special to pay attention to?

Unfortunately, I cannot say whether the frames fit; you should research that best on the website of the manufacturer of your switch program (e.g., Gira). However, I can only recommend working with keystones and not using the cheapest material here either, as the assembly effort is significantly lower with slightly more expensive systems. Telegärtner is mentioned here as an example. Once you have decided on a system, you choose the appropriate covers from the manufacturer of your switch program.

In the network cabinet, definitely rely on Keystone technology. Each individual cable can be fitted with a Keystone Jack and only then clipped into the patch panel frame. It’s much more relaxed that way!

How much time do you save with the Keystone installation? 20 seconds? ...

If you are a trained electrician, then maybe. As a layperson, significantly more, furthermore you do not need any special tools to connect the cable.

Thanks to the colored cable guide, the likelihood is high that you will connect the correct wires together.

Some cable guides show the wiring according to two standards, 568A or 568B.

Here you should choose one standard for the entire house, but strictly between two points. 586A is the standard in Europe.

The frames are the same. Only the insert has to fit. I also recommend keystone for DIY. Of course, I didn’t do it and wired 28 pieces in our house. About 1/4 were fine and for the rest, I had to go back at least once until the cable ran out in some cases. Then I had to pull cables through again. I think I aged 5 years that weekend and was closer to tears than ever before. Keystones in the distribution cabinet all worked immediately.

It's really not that difficult to terminate a standard network socket or a patch panel...

I did it myself for the first time and correctly connected 18 sockets here...