create notes file on git

git.md

@@ -0,0 +1,25 @@
+---
+author: Alvie Rahman
+date: \today
+title: Git notes
+---
+
+
+# Fix detached head
+
+From https://stackoverflow.com/a/10229202 :
+
+## To Delete Changes
+
+```
+git checkout main
+```
+
+## To Keep Changes
+
+```
+git branch temp
+git checkout main
+git pull . temp
+git branch -D temp
+```