diff --git a/wiki/linux/init.md b/wiki/linux/init.md
new file mode 100644
index 0000000..1eeaf99
--- /dev/null
+++ b/wiki/linux/init.md
@@ -0,0 +1,11 @@
+# Init
+
+The init process is the first process started after boot.
+All processes running in later stages are descendants of the init process.
+The init process is given to a init system that manages various services.
+
+## Init Services
+
+The following is a list of available init services.
+
+- [SystemD](/wiki/linux/systemd.md) is most common among linux systems.
diff --git a/wiki/linux/networkmanager.md b/wiki/linux/networkmanager.md
new file mode 100644
index 0000000..8ea2922
--- /dev/null
+++ b/wiki/linux/networkmanager.md
@@ -0,0 +1,27 @@
+# NetworkManager
+
+NetworkManager - short NM - is a program to automatically detect and connect to
+networks by providing options for various configuration.
+
+## Installation
+
+NetworkManager can be installed with the `networkmanager` package on most linux
+distributions which provides daemon aswell as `nmcli` a command line interface
+and `nmtui` a terminal user interface for configuration.
+Additionally `nm-connection-editor` can be installed for a graphical user
+interface.
+
+## Usage
+
+After installation `networkmanager.service` has to be enabled by the used
+[init-system](/wiki/linux/init.md) (for example
+[systemD](/wiki/linux/systemd.md#startstopenabledisable-a-service)).
+
+### OpenVPN
+
+NetworkManager needs a plugin to work with openvpn configurations.
+This plugin can be installed with the `networkmanager-openvpn` package.
+
+OpenVPNs `.ovpn` files can then be imported by running
+`nmcli connection import type openvpn file <openvpn-file>`.
+Afterwards the can be modified accordingly.
diff --git a/wiki/linux/systemd.md b/wiki/linux/systemd.md
index 56c7180..10eebca 100644
--- a/wiki/linux/systemd.md
+++ b/wiki/linux/systemd.md
@@ -1,7 +1,7 @@
 # SystemD
 
-SystemD is a software suit for system components for Linux systems.
-It is mainly used for service configuration.
+SystemD is an [init system](./init.md) for Linux systems.
+It is used for service configuration and startup.
 
 ## Run command on boot
 
@@ -40,3 +40,12 @@ Alternatively it can be enabled to start at every boot by running:
 ```sh
 sudo systemctl enable unturned
 ```
+
+## Start/Stop/Enable/Disable a service
+
+Services can be started by running `systemctl start <service-name>`.
+They respectively can be stopped by replacing the `start`
+keyword for `stop`.
+To start the service after boot it has to be enabled.
+This works accordingly with the keyword `enable`.
+The `disable` keyword stops the service from starting automatically.