In order to be able to be listed in search results, your marketplace is indexed by search engines. To improve your listing position, there are a few things you can do to help. These actions are called Search Engine Optimization (or SEO).
SEO in your marketplace
Your Sharetribe marketplace is developed using SEO best practices. Common tags (such as description or title) are automatically added to each page and you can customize them according to your strategy.
The default values are relevant for most websites so you can focus on improving your social presence and getting more inbound links, for example. However it's always a good idea to customize them to make your tags unique.
It is also possible to add more meta tags by using Sharetribe's custom script functionality.
Resources to improve your search engine ranking
SEO isn't only about code-related changes. It is also heavily dependent on link building and social media activity. Moz (among others) provides lots of great resources to learn more about SEO to help your with your SEO strategy.
Another good tool to use is Google Search Console (Webmaster Tools). It will tell you how Google sees your website. Read the how to add the GSC verification tag knowledge base article for setup instructions.
How about the robots.txt and sitemap.xml files?
Robots.txt and sitemap.xml help search engines index your websites. Learn more about them from these knowledge base articles:
You can find direct links to them in the SEO section of your admin panel.