How to connect a new outlet to existing ones?
In the wall, 4 wires are suitable for sockets, sockets in the wall are connected in series.
https://our.electricianexp.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.
Sockets MAY NOT be connected in series by definition. Not in any case. You confuse the loopback and star connections, read the article first
Most likely you need to conduct a phase and zero from an existing outlet, directly from its terminals.