According to Google:
“Relevancy is determined by over 200 factors, one of which is the PageRank for a given page. PageRank is the measure of the importance of a page based on the incoming links from other pages. In simple terms, each link to a page on your site from another site adds to your site's PageRank. “ (https://support.google.com/webmasters/answer/70897?hl=en)
Another factor for PageRank relevancy is content. We’ve said it before, content is king in the world of search engines. You need to craft your web content using the keywords you want to rank for. Wherever it makes sense (and it should read naturally), use keywords within the text of your pages, within image file names, within the URLs including your domain name, folder and HTML file names.
When I searched “electric bike” this listing came up on top: https://electricbikereview.com/best-electric-bikes/. As you can see just from this, both the domain name and the folder name contain the keyword “electric bike.”
When I scanned the webpage further, I found the critical keywords plugged into the content:
bike- 140 times
electric- 119 times
electric bike- 96 times
It makes sense this one page ranks so high with that many keywords included!
There isn’t an overnight solution to rank high organically on search engine results, but it is true that your content matters, and can help get you there eventually.