Search notes:

/etc/netctl

/etc/netctl stores netctl profiles.
Example profiles are stored under /etc/netctl/examples.
Profiles can be created with wifi-menu.

Configuration without password

Description='Wifi connection without passowrd'
Interface=wlp3s0
Connection=wireless
ESSID=Hotel_XYZ
IP=dhcp

Configuration with password

Description='Wifi connection with password'
Interface=wlp3s0
Connection=wireless
Security=wpa
ESSID=theEssId
IP=dhcp
Key=…

Starting

To start the network associated with config-file in /etc/netctl: 
sudo netctl start config-file
To automatically start the network associated with config-file on next bootup: 
sudo netctl enable config-file
See also https://unix.stackexchange.com/questions/276844/how-do-i-automatically-execute-netctl-start-tq84-wifi-on-bootup

Automatically starting the NTP daemon

In order to automatically start the NTP daemon when the network is started up, the following two lines might be added to a network profile: 
ExecUpPost='/usr/bin/ntpd || true'
ExecDownPre='killall ntpd || true'

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