Number of network sockets; how to plan Wi-Fi in the new building?

You don't have to do a network overkill, but every new house should have a few network outlets. In my opinion, everything stationary should be connected by cable. Therefore, it is best to install a double socket in every room. Don't forget to prepare future hobby rooms and offices. Where the router goes is always a tricky issue. Many put it somewhere central. But in some corner, close to the floor, with a few cables and a cabinet, and then wonder why the Wi-Fi doesn't reach far. My favorite nowadays is router for connection and one or two access points on the ceiling depending on the floor plan. How should the telephone be realized?

This is a completely normal network cabling and has nothing to do with “Smarthome”. The faster the internet access, the more important it is to have a good infrastructure in the house. If you don't do anything now, you are on the level of the last century. Repeaters and powerline adapters are emergency solutions and have no place in new houses.

those are repeaters to me,

Repeaters are stupid, they don’t switch anything, they don’t route anything – basically they pretend as a "proxy" a closer receiver to the sender and a closer sender to the receiver.

I don't really understand why everything should be wired everywhere. Doesn't a well-placed Fritzbox + WLAN everywhere + a good provider with fiber or something similar + possibly repeaters in the attic suffice? It's okay that the NAS or similar devices are directly connected to the router, but everything else? My notebook doesn't even have a network port anymore... Regards

With that argumentation, you could also be against power outlets and in favor of power strips. That your notebook (let's call it a laptop to get closer to its use) is on WLAN is okay. But everything that is location-bound—there is no single reason why that shouldn't be fixed with a plug. After all, it's plugged in to the power supply as well. Addendum: At the LAN to WLAN socket in the hallway, I only have a single outlet, and in the study, only a double outlet, and both are a pain in the ass for me.

In an emergency, you can also connect a mini switch to a socket. But there should be at least one network socket in every room!

In case of emergency, you can also connect a mini switch to a socket. But there should be at least one network socket in every room!

Seriously, your toilet needs LAN too?

It's not so far-fetched if, for example, you want to place a streaming speaker in the WC / bathroom and cannot or do not want to operate it via WLAN.