This is HTML template. To getting started you need only Browser to run HTML files. Better upload files to web server and run the site there.
If template is opened from local file system, some functions and may not work. For example functions, that required PHP – Instagram, Twitter, Contact Form.
To customize template you can edit CSS and HTML files. Also if you are developer, there are available source files SCSS and JS (required ES6 transpiller). All used plugins added from Bower.
For each pages available blank CSS file for your customizations. See it here –
To set up some script things, there is available init script, where you can change default options –
All code in Snow commented and easy to edit things in HTML, CSS and JS files.