To initialize a Git repository in an existing project folder, you can follow these steps:
Open a terminal or command prompt and navigate to the root folder of your existing project.
Run the command git init. This will create a new, empty Git repository in your project folder.
Optional: Create a .gitignore file in the project folder if you want to exclude certain files or directories from being tracked by Git. You can list the patterns of files/directories to ignore in this file.
Add the project files to the Git repository by running git add . This command adds all the files in the current directory and its subdirectories to the staging area.
Commit the changes by running git commit -m "Initial commit". This will create the first commit in your repository with the message "Initial commit". From this point, Git will start tracking changes to your project files.
Now, your existing project folder is initialized as a Git repository, and you can start using Git commands to manage your project's version control.