May I know how to stage all the files in a folder like a folder called subfolder on git?
Have tried
git add subfolder/\\*
but doesn't work.
Just use git add subfolder.
I usually use git add . in the root of the repository to stage all files in the repo.
If you want to use the asterisk, you should use git add subfolder/* because the shell will expand this into git add subfolder/foo subfolder/bar subfolder/... with all the files in the directory.
When using git add subfolder/\\*, the shell won't expand the asterisk, which will cause it to call git add subfolder/* which tries to add a file called * in the subfolder.