diff --git a/docs/dev_tools/debug.md b/docs/dev_tools/debug.md
new file mode 100644
index 0000000000000000000000000000000000000000..e668173ac2e3548ed64b5155428ee45e8e7cf93c
--- /dev/null
+++ b/docs/dev_tools/debug.md
@@ -0,0 +1,53 @@
+---
+title: Debugging
+tags:
+- documentation
+- tools
+---
+
+# Debugging Drupal Code
+
+## Add a PHP Server
+
+First, you have to set up a Drupal environment with the tool [l3d](../docker/l3d/index.md). The tool is
+based on Docker containers.
+
+Now navigate to File->Settings in your IDE and create a server:
+
+
+
+Set the following values:
+
+
+
+**Important: Always use Docker as name of your server.**
+
+Do not forget to add the file mapping to `/var/www/html`.
+
+## Add a new Run/Debug Configuration
+
+
+
+First create a new `PHP Web Page` configuration:
+
+
+
+Set the following values:
+
+
+
+Select the server you just have created.
+
+**Important: Always use Docker as name of your configuration.**
+
+## Start Debugging
+
+First, check the debug settings in your IDE. It should look something like this:
+
+
+
+Now activate the `Phone` icon in your IDE:
+
+
+
+Now you can set your breakpoints and enjoy debugging Drupal code.
diff --git a/docs/dev_tools/host.md b/docs/dev_tools/host.md
new file mode 100644
index 0000000000000000000000000000000000000000..7333e70361b6aa780a7f2fd759b233f46ed490ca
--- /dev/null
+++ b/docs/dev_tools/host.md
@@ -0,0 +1,100 @@
+---
+title: Host setup
+tags:
+- documentation
+- tools
+---
+# Host setup
+
+## Recommended files in developer's HOME directory
+
+### ~/.env
+
+```dotenv
+COMPOSER_DOWNGRADE=0
+DOCKER4DRUPAL_LIVE_HOST_USERNAME=YOURNAME
+DOCKER4DRUPAL_TRAEFIK_CERT=fullchain.pem
+DOCKER4DRUPAL_TRAEFIK_DOMAIN=docker.localhost
+DOCKER4DRUPAL_TRAEFIK_KEY=privkey.pem
+DOCKER4DRUPAL_TRAEFIK_PORT=80
+DOCKER4DRUPAL_TRAEFIK_PORTAINER=1
+DOCKER4DRUPAL_TRAEFIK_PORTS=443
+DOCKER4DRUPAL_TRAEFIK_USESSL=0
+DORGFLOW=0
+DRUPAL_LIVE=0
+MAILHOG_HOST=smtp.freesmtpservers.com
+MAILHOG_MECHANISM=NONE
+MAILHOG_PASSWORD=
+MAILHOG_PORT=25
+MAILHOG_USERNAME=
+PHP_DEBUG=0
+PHP_VERSION=7.4
+WEBSERVER_CONFIG_OVERWRITE=0
+```
+
+### ~/.gitconfig
+
+```editorconfig
+[user]
+ name = YOURNAME
+ email = YOUREMAIL
+[core]
+ autocrlf = input
+ excludesfile = ~/.gitignore_global
+[push]
+ default = simple
+[filter "lfs"]
+ clean = git-lfs clean -- %f
+ smudge = git-lfs smudge -- %f
+ required = true
+ process = git-lfs filter-process
+[credential]
+ helper = cache --timeout=3600
+[init]
+ templatedir = ~/.git-templates
+```
+
+### ~/.gitignore_global
+
+```gitignore
+.idea/
+*.iml
+test.http
+```
+
+### ~/.composer/auth.json
+
+```json
+{
+ "http-basic": {
+ "git.drupalcode.org": {
+ "username": "YOURNAME",
+ "password": null
+ }
+ },
+ "github-oauth": {
+ "github.com": "YOURTOKEN"
+ },
+ "gitlab-oauth": {},
+ "gitlab-token": {
+ "gitlab.lakedrops.com": "YOURTOKEN",
+ "gitlab.com": "YOURTOKEN",
+ "git.drupalcode.org": "YOURTOKEN"
+ }
+}
+```
+
+### ~/.docker/config.json
+
+```json
+{
+ "auths": {
+ "registry.gitlab.com": {
+ "auth": "YOURAUTH"
+ },
+ "registry.lakedrops.com": {
+ "auth": "YOURAUTH"
+ }
+ }
+}
+```
diff --git a/docs/dev_tools/index.md b/docs/dev_tools/index.md
index 8223adbd4b2d479f76958e62bf7a3df5912977ec..02c942dbfcef272f95753bc38b9d90d01b1fd61c 100644
--- a/docs/dev_tools/index.md
+++ b/docs/dev_tools/index.md
@@ -10,54 +10,3 @@ tags:
We use the IDE's IntelliJ and PHPStorm from [Jetbrains](https://jetbrains.com), because we are convinced to use best toolset in the
market so far.
-
-## Debugging Drupal Code
-
-### Add a PHP Server
-
-First, you have to set up a Drupal environment with the tool [l3d](../docker/l3d/index.md). The tool is
-based on Docker containers.
-
-Now navigate to File->Settings in your IDE and create a server:
-
-
-
-Set the following values:
-
-
-
-**Important: Always use Docker as name of your server.**
-
-Do not forget to add the file mapping to `/var/www/html`.
-
-### Add a new Run/Debug Configuration
-
-
-
-First create a new `PHP Web Page` configuration:
-
-
-
-Set the following values:
-
-
-
-Select the server you just have created.
-
-**Important: Always use Docker as name of your configuration.**
-
-### Start Debugging
-
-First, check the debug settings in your IDE. It should look something like this:
-
-
-
-Now activate the `Phone` icon in your IDE:
-
-
-
-Now you can set your breakpoints and enjoy debugging Drupal code.
-
-## Execute Drupal tests within your IDE
-
-
diff --git a/docs/dev_tools/test.md b/docs/dev_tools/test.md
new file mode 100644
index 0000000000000000000000000000000000000000..5f9239d15f8813f5283d02caeb5f180558375c52
--- /dev/null
+++ b/docs/dev_tools/test.md
@@ -0,0 +1,8 @@
+---
+title: Testing
+tags:
+- documentation
+- tools
+---
+
+# Testing Drupal Code
diff --git a/mkdocs.yml b/mkdocs.yml
index 3dbbab89e4d707b0888dee9952cc6104bcf3602c..0b2a9a9fe2150a98311ec4e8ed93aa3ce8146ced 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -226,3 +226,6 @@ nav:
- Tools: devops/alm/tools.md
- Developer Tools:
- Home: dev_tools/index.md
+ - Host Setup: dev_tools/host.md
+ - Debugging: dev_tools/debug.md
+ - Testing: dev_tools/test.md