There is no git diff.

Maybe it's because I haven't committed yet.Even before committing

 git status-v-v

I think I was able to do something similar to diff in

I think it's in the staging area.
You can use git diff if you just changed it and haven't posted it to the staging area yet.
If you are posting to a staging area and want to see the editing location, use git diff --cached
I think I can do it.
Wouldn't it be possible to check the difference now?

Reference site

We recommend that you review the git status results again.
Also, if you present the results here without any problems, I think you will get a more accurate answer.

First of all, based on the current information, we can think of the following possibilities:

• In this case, git status should display as Untracked files (*).

• In this case, git status should display Changes to be committed ( )).
• git diff is a command that looks at the difference between the working tree and the index, and when added to the index, there is no difference, so nothing is displayed.
• You can use the git diff --cached command to see this difference (the difference between index and HEAD).

*The message may vary slightly depending on the version.