What command do you use to add changes to the staging area in Git?

To add changes to the staging area in Git, you use the git add command. Here are a few examples:

1. To add a specific file:

   git add filename.txt

2. To add multiple specific files:

   git add file1.txt file2.txt

3. To add all changes in the current directory:

   git add .

4. To add all files with a specific extension (e.g., .js):

   git add *.js

This command prepares your changes for the next commit.