Some photo materials can have privacy issues, and you should learn that before using those on your page template or WordPress themes. To start any website with an HTML template, you will need content free or premium.
You can also design an online presentation of various forms of a single page website with a click. They are clean, free templates and have a live demo. And please note that most of the page templates have simple HTML. A landing page usually comes as a template demo supplied by free CSS templates or free CSS website, allowing to catch visitor's interest with various color schemes and a collection of stylish web design template and elements. The builder uses an HTML ecommerce website template for a simple landing page as a complete or fully responsive website became spread and popular.
Web design and responsive site prototyping, including eCommerce, have changed recently.