diff --git a/docs/bash.md b/docs/bash.md
new file mode 100644
index 0000000..a784354
--- /dev/null
+++ b/docs/bash.md
@@ -0,0 +1,19 @@
+# Bash Commands
+
+## Find
+### Find and delete
+Find and delete command
+```bash
+find / -name .DS_Store -delete
+```
+
+Alternative find and delete command
+```bash
+find / -name ".DS_Store" -exec rm {} \;
+```
+the previous command is due that not all `find` have a delete funcion but with overhead of new process `-exec`.
+
+Find and delete with no overhead
+```bash
+find / -name .DS_Store -print0 | xargs -0 rm
+```
\ No newline at end of file
diff --git a/docs/cd.md b/docs/cd.md
new file mode 100644
index 0000000..7137154
--- /dev/null
+++ b/docs/cd.md
@@ -0,0 +1 @@
+# Continuous delivery
\ No newline at end of file
diff --git a/docs/ci.md b/docs/ci.md
new file mode 100644
index 0000000..9ab5bf8
--- /dev/null
+++ b/docs/ci.md
@@ -0,0 +1 @@
+# Continuous integration
\ No newline at end of file
diff --git a/docs/cicd.md b/docs/cicd.md
deleted file mode 100644
index 318a768..0000000
--- a/docs/cicd.md
+++ /dev/null
@@ -1,5 +0,0 @@
-# CI / CD
-
-## Continuous integration
-
-## Continuous delivery
\ No newline at end of file
diff --git a/docs/csharp.md b/docs/csharp.md
new file mode 100644
index 0000000..d03b881
--- /dev/null
+++ b/docs/csharp.md
@@ -0,0 +1 @@
+# C#
\ No newline at end of file
diff --git a/docs/linux.md b/docs/linux.md
index 461a8e6..5cc4b51 100644
--- a/docs/linux.md
+++ b/docs/linux.md
@@ -1,3 +1,2 @@
 # Linux
 
-## Arch Linux and X220
\ No newline at end of file
diff --git a/mkdocs.yml b/mkdocs.yml
index e28f3c2..030d7f3 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -2,4 +2,19 @@ site_name: F-Docs
 theme:
     name: 'material'
 repo_url: https://git.r4o.ch/francesco/mkdocs/
-docs_dir: 'docs'
\ No newline at end of file
+docs_dir: 'docs'
+
+# Page tree
+nav:
+  - Home: index.md
+  - Programming:
+    - Python: python.md
+    - C#: csharp.md
+      - 
+  - CI / CD:
+    - CI: ci.md
+    - CD: cd.md
+  - Docker: docker.md
+  - Linux: linux.md
+  - Network:
+    - 
\ No newline at end of file