If you've made changes to your files and added them to the staging area using git add but haven't yet committed those changes, you can undo the add using the git reset command.
 
Here are the steps to undo a git add before commit:
 
First, use the git status command to see the files that you have added to the staging area.
 
Use the git reset <file> command to remove the file from the staging area. If you want to remove all files from the staging area, you can use git reset.
 
Check the status again using git status to ensure that the file is no longer in the staging area.
 
Here's an example:
$ git status
On branch main
Changes to be committed:
 (use "git restore --staged <file>..." to unstage)
    modified:   file1.txt
   modified:   file2.txt
$ git reset file1.txt
$ git status
On branch main
Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
    modified:   file2.txt

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
    modified:   file1.txt
In this example, we've removed file1.txt from the staging area using git reset file1.txt. Now, it is showing up as "Changes not staged for commit" instead of "Changes to be committed".