How to connect a new outlet to existing ones?
How to connect a socket parallel to a socket already connected in series with other sockets?
In the wall, 4 wires are suitable for sockets, sockets in the wall are connected in series.
In the wall, 4 wires are suitable for sockets, sockets in the wall are connected in series.
Sockets MAY NOT be connected in series by definition. Not in any case. You confuse the loopback and star connections, read the article first https://electro.tomathouse.com/en/kak-soedinyat-rozetki-posledovatelno-ili-parallelno.html - if the questions do not disappear by themselves, then specify your question here again.
Most likely you need to conduct a phase and zero from an existing outlet, directly from its terminals.
Most likely you need to conduct a phase and zero from an existing outlet, directly from its terminals.

