(1) Go to the folder where you want to store your project, and clone the new repository:

git clone https://github.com/<username>/<username>.github.io.git

The directory structure is as follows:

.
├── contents
└── static
    ├── assets
    │   └── img
    ├── css
    └── js

(2) Modify the content of each section, which corresponds to contents/*.md.

(3) Adjust the title, copyright information, and other text of the website in contents/config.yml

(4) Replace background image and photo with new ones for your web pages in static/assets/img/

(5) Push it:

git commit -am 'init'
git push