Setting wifi and ethernet fixed IP address. Wifi as main internet connection and ethernet cable for stand-alone device.
sudo nano /etc/dhcpcd.conf
Add the following code.
interface wlan0
static ip_address=192.168.1.11/24
static routers=192.168.1.1
static domain_name_servers=8.8.8.8
interface eth0
static ip_address=192.168.2.10