Update HOWTO.md

HOWTO.md

@@ -21,7 +21,7 @@
     For the topology data creation
     - [NVDCT (NetworkVisualizationDataCreationTool) plugin](https://thl-cmk.hopto.org/gitlab/checkmk/vendor-independent/nvdct)
 
-    For topology visualization (only CMK 2.2.0x, CMK 2.3.0 has this built-in)
+    For topology visualization (**only CMK 2.2.0x**, CMK 2.3.0 has this built-in)
     - [Network visualization plugin](https://exchange.checkmk.com/p/network-visualization)
 
     **Note**: [Here](https://thl-cmk.hopto.org/gitlab/explore/projects/topics/Network%20Visualization) you can find all plugins from this page at one place.
@@ -29,6 +29,7 @@
     If you are done with the package installation your package repository should look like this
     ![](img/installed_packages.png "Installed extensions")
 
+Here you will find help on [Checkmk extension packages (MKPs)](https://docs.checkmk.com/latest/en/mkps.html).
 
 1. Checkmk Rules
 
@@ -38,6 +39,8 @@
     - Normal check interval for the HW/SW inventory check
     ![](img/hw_sw_inventory_check_interval.png "Check interval for HW/SW inventory")
 
+    Here you will find help on CMKs [HW/SW Inventory](https://docs.checkmk.com/latest/en/inventory.html)
+
 1. Host labels
 
     Some parts of the NVDCT are dependent on the presence of certain host labels:
@@ -52,6 +55,8 @@
     Depending on the host data, the host labels should then be found on the host.
     ![](img/host_labels.png)
 
+    Here you will find help on [Including labels found in the discovery check](https://docs.checkmk.com/latest/en/labels.html?lquery=host%20label#discovery_check)
+
 
 1. Check the HW/SW inventory