Now open http://localhost:4000/ in your browser, you can see a built-in blog.
The theme that I used is Next.
After cloning, open the _config.yml file under the root directory, find the theme keyword, and change its value to next.
Now refresh the page http://localhost:4000/, you can see the theme is enabled.
Edit the _config.yml file. Under the deploy, add your github repository and set the branch to master.
Then execute the following command.