diff --git a/wiki/linux/arch-linux/installation.md b/wiki/linux/arch-linux/installation.md
index 3d30897..d37400a 100644
--- a/wiki/linux/arch-linux/installation.md
+++ b/wiki/linux/arch-linux/installation.md
@@ -136,7 +136,12 @@ en_US.UTF-8 UTF-8
 
 - `locale-gen` - Generate languages
 - `echo KEYMAP=de-latin1-nodeadkeys > /etc/vconsole.conf` - set the keymap
-- `tzselect` - Set region
+- `cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime` - set your timezone
+  (select the first file accordingly to your location)
+- `date +%Y%m%d -s "<yyyymmdd>"` - set the current date (change
+  values accordingly)
+- `date +%T -s "<hh:mm:ss>"` - set the current time (change values accordingly)
+- `hwclock -w` - sync the current date and time with the hardware clock
 
 ## 9. Configure and create kernel-image
 
diff --git a/wiki/linux/date.md b/wiki/linux/date.md
new file mode 100644
index 0000000..ac26360
--- /dev/null
+++ b/wiki/linux/date.md
@@ -0,0 +1,39 @@
+# Date
+
+`date` is a program to show and edit the date and time of a system.
+To change the hardware clock look at the [according article](./hwclock.md)
+
+## Display time and date
+
+To change the time and date run the following command:
+
+```shell
+date
+```
+
+## Change the date and time
+
+To change the date run the following command with an adjusted value for the
+date:
+
+```shell
+date +%Y%m%d -s "20210809"
+```
+
+To change the time run the following command with an adjusted value for the
+date:
+
+```shell
+date +%T -s "18:49:42"
+```
+
+After that you can check if the time is correct by displaying it.
+
+## Set timezone
+
+To set your timezone run the following command with the accordingly selected
+file for your location:
+
+```shell
+cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime
+```
diff --git a/wiki/linux/hwclock.md b/wiki/linux/hwclock.md
new file mode 100644
index 0000000..a561420
--- /dev/null
+++ b/wiki/linux/hwclock.md
@@ -0,0 +1,19 @@
+# HWClock
+
+`hwclock` is a program to set and display the hardware clock.
+
+## Display time and date
+
+To display the hardware clock run the following command:
+
+```shell
+hwclock
+```
+
+## Sync the hardware clock to the system time
+
+To sync the hardware clock run the following command:
+
+```shell
+hwclock -w
+```
diff --git a/wiki/linux/ip.md b/wiki/linux/ip.md
new file mode 100644
index 0000000..7dc37c3
--- /dev/null
+++ b/wiki/linux/ip.md
@@ -0,0 +1,27 @@
+# IP
+
+`ip` is a program that can edit and display the configurations of network
+interfaces, routing and tunnels.
+It is a replacement for the program `ifconfig`.
+
+## List all network interfaces
+
+You can list network interfaces by running:
+
+```shell
+ip link list
+```
+
+## Enable/disable a network interface
+
+Assuming the interface is named `wlan0` run the following:
+
+```shell
+ip link set wlan0 up
+```
+
+Disabling works accordingly by running:
+
+```shell
+ip link set wlan0 down
+```
diff --git a/wiki/linux/wpa_supplicant.md b/wiki/linux/wpa_supplicant.md
new file mode 100644
index 0000000..1497a0d
--- /dev/null
+++ b/wiki/linux/wpa_supplicant.md
@@ -0,0 +1,17 @@
+# WPA Supplicant
+
+`wpa_supplicant` is a free implementation of an IEEE 802.11i supplicant.
+It is especially interesting due to its WPA2 and WPA3 capabilities in contrast
+to other networking software.
+
+## Connect to a WPA2 secured WLAN
+
+This part assumes that your network interface is called `wlan0`
+(change it accordingly).
+
+- First make sure that your [network interface is up](./ip.md).
+- Save the authentication details to a file by running
+  `wpa_passphrase <SSID> >> /etc/wpa_supplicant.conf`
+- Connect to the WLAN by running
+  `wpa_supplicant -B -D wext -i wlan0 -c /etc/wpa_supplicant.conf`
+  (`-B` is optional for running the process in the background)