Gitのdetached HEADで作ったコミットをブランチにする方法

$ git checkout v1.0
Note: switching to 'v1.0'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at cf91611 料金表を追加

$ git commit -m "送料無料の条件を追記"
[detached HEAD 28d2c50] 送料無料の条件を追記
 1 file changed, 1 insertion(+), 1 deletion(-)

$ git commit -m "代引き手数料を追記"
[detached HEAD 164991c] 代引き手数料を追記
 1 file changed, 1 insertion(+)

$ git status
HEAD detached from v1.0
nothing to commit, working tree clean

$ git branch
* (HEAD detached from v1.0)
  main

$ git log --oneline --graph --all
* 164991c 代引き手数料を追記
* 28d2c50 送料無料の条件を追記
| * fbdf273 READMEに営業時間を追加
|/  
* cf91611 料金表を追加
* efa914a 最初のコミット

$ git switch -c fix/price
Switched to a new branch 'fix/price'

$ git status
On branch fix/price
nothing to commit, working tree clean

$ git branch
* fix/price
  main

$ git log --oneline --graph --all
* 164991c 代引き手数料を追記
* 28d2c50 送料無料の条件を追記
| * fbdf273 READMEに営業時間を追加
|/  
* cf91611 料金表を追加
* efa914a 最初のコミット

$ git commit -m "READMEに問い合わせ先を追加"
[detached HEAD 7e09e2d] READMEに問い合わせ先を追加
 1 file changed, 2 insertions(+)

$ git switch main
Warning: you are leaving 1 commit behind, not connected to
any of your branches:

  7e09e2d READMEに問い合わせ先を追加

If you want to keep it by creating a new branch, this may be a good time
to do so with:

 git branch <new-branch-name> 7e09e2d

Switched to branch 'main'

$ git log --oneline --graph --all
* 164991c 代引き手数料を追記
* 28d2c50 送料無料の条件を追記
| * fbdf273 READMEに営業時間を追加
|/  
* cf91611 料金表を追加
* efa914a 最初のコミット

$ git reflog -3
fbdf273 HEAD@{0}: checkout: moving from 7e09e2d423d408baab1ae76c29d5c1c0b358504b to main
7e09e2d HEAD@{1}: commit: READMEに問い合わせ先を追加
cf91611 HEAD@{2}: checkout: moving from fix/price to v1.0

$ git branch fix/readme 7e09e2d

$ git branch
  fix/price
  fix/readme
* main

$ git log --oneline --graph --all
* 7e09e2d READMEに問い合わせ先を追加
| * 164991c 代引き手数料を追記
| * 28d2c50 送料無料の条件を追記
|/  
| * fbdf273 READMEに営業時間を追加
|/  
* cf91611 料金表を追加
* efa914a 最初のコミット

$ git status
On branch main
nothing to commit, working tree clean