Defining wlan0 + eth0 in same network segment

General questions
1

Hi,
how must I create interfaces wlan0 + eth0 using the same network segment 192.168.1.0/24?

With another router (e.g. AVM Fritz!Box) all connected devices are in the same network segment.

THX

2

set up a bridge interface.
https://wiki.vyos.net/wiki/Bridge_Interfaces