What to do heroku not working git add .?

Question

git

I do everything according to the instructions, but then I type git add . is nothing happening?
despite the fact that I do everything according to the instructions on the site ( https://dashboard.heroku.com/apps/kwakwabot/deploy... )
{Install the Heroku CLI
Download and install the Heroku CLI.

If you haven't already, log in to your Heroku account and follow the prompts to create a new SSH public key.

$ heroku login
Create a new Git repository
Initialize a git repository in a new or existing directory

$ cd my-project/
$ git init
$ heroku git:remote -a kwakwabot
Deploy your application
Commit your code to the repository and deploy it to Heroku using Git.

$ git add .
$ git commit -am "make it better"
$ git push heroku master
You can now change your main deploy branch from "master" to "main" for both manual and automatic deploys, please follow the instructions here.
Existing Git repository
For existing repositories, simply add the heroku remote

$ heroku git:remote -a kwakwabot {
and after typing git add . nothing happens. What to do?