add diagrams and tagging info

commit.md

@@ -112,6 +112,39 @@ If you have no merge conflicts all will be good and the code will now appear in
 
 > If you do have a **merge conflict** we'll deal with this in the [merging](./merging.md) file.
 
+If you want to visualise this on your git diagram what you've done is effectively this:
+
+```marmaid
+gitGraph
+    commit id: "first commit"
+    commit id: "updates"
+```
+
+### Tagging
+
+Now you have a release lets look at how you tag that commit as a particular version. Here we turn your current version into a **v1.0** tag.
+
+```bash
+git tag -a v1.0 -m "my version 1.0"
+```
+
+This is effectively what happens in your git branch.
+
+```marmaid
+gitGraph
+    commit id: "first commit"
+    commit id: "updates" tag: "v1.0"
+```
+
+To list your tags you can run:
+
+```bash
+# list all tags
+git tag
+
+# To filter tags to a certain string
+git tag -l "v1.*"
+```
 ---
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