new: Added Instructions to wipe a repository.

know-how/git-commands.md

@@ -131,4 +131,14 @@ git branch -m main wikiMaster
 git push origin HEAD
 ```
 
+Wipe a whole git repository, removing all branches, tags, and history, leaving behind only a single, empty main branch. 
+
+```bash
+git checkout --orphan main && \
+git rm -rf . && \
+git commit --allow-empty -m "Initialize empty main branch" --no-verify && \
+git push origin main --force && \
+git for-each-ref --format='%(refname:short)' refs/heads/ | grep -v '^main$' | xargs -I{} git push origin --delete {} && \
+git tag -l | xargs -n 1 git push --delete origin
+```