Add an example of using tags

36_git/README.md

@@ -82,12 +82,6 @@ git effort -- --since='yesterday'
 git effort -- --since='1 month ago'
 ```
 
-### Check tag format
-
-```sh
-git check-ref-format "tags/0.0.1-a39f8a821fc9" 
-```
-
 ## Resources
 
 * [git-extras](https://github.com/tj/git-extras/blob/master/Commands.md) are a really good set of useful supplementary commands.  

36_git/sections/TAGS.md

@@ -0,0 +1,41 @@
+# TAGS
+
+Demonstrate how to use tags with git.  
+
+## Clone repository
+
+```sh
+gh repo clone kubernetes/ingress-nginx    
+```
+
+## Tags
+
+```sh
+# list tags
+git tag
+
+# sync to a tag
+git checkout helm-chart-3.31.0
+git checkout helm-chart-4.0.1
+git checkout helm-chart-3.41.0
+```
+
+## Check tag format
+
+The git check-ref-format command is used to ensure that a reference name (like a branch, tag, etc.) is well-formed.  
+
+```sh
+git check-ref-format "tags/0.0.1-a39f8a821fc9" 
+```
+
+## Diffing tags
+
+```sh
+# show files with diff in a specific folder
+git diff --summary helm-chart-3.31.0..helm-chart-4.0.1 -- ./charts/
+
+# diff files
+git diff helm-chart-3.31.0..helm-chart-4.0.1 -- ./charts/ 
+```
+
+## Resources