Just click Use this template to create your blog site in https://github.com/guangzhengli/hugo-ladder-exampleSite
Create a new repository(GitHub Pages) from hugo-ladder-exampleSite to enter : username.github.io. replace the username by your GitHub account.
Then configure the GitHub page setting following:
🎉🎉🎉 Open the browser and enter: https://username.github.io 🎉🎉🎉