Google ranks every page and not just your domain...
This may be the most important thing to realize if you're building a website.
Google doesn't only rank your domain or .com.
Google also ranks each individual page.
For more opportunities to get traffic from Google, create more pages.
It's entirely possible that each of your pages can rank for dozens of keywords.
Some of those keywords may not deliver much traffic, but it all adds up!
You want to have as many high-quality pages on your site as possible as each one allows you to get more traffic and hopefully earn more money as well.