It appears that the reason this page from a little-known website is able to rank amongst the bigger players is that the content itself is more focussed. It talks about how to name images for SEO, whereas most of the other pages are more general guides to image SEO—which all presumably mention the importance of naming images correctly, amongst other things.
Google’s aim is to provide the most relevant result for any given query. Their entire business model relies on them being able to do this, consistently, across hundreds of billions of searches. For that reason, they’ve invested heavily into understanding the intent of queries, i.e., the reason a person typed a specific thing into Google in the first place.

Hello. I just want to say thanks for this tutorial, it is SUPER HELPFUL! One question though; I can’t seem to find where on my channel or which page that shows me the “About Results” you know, for determining if a key word is too large to compete with. I see in your tutorials how it appears at the top of the page not too far from where it says “filter” after searching the word or phrase. Did YouTube get rid if this display? Please let me know brother when you can. Thanks!@
Thanks for the post. I found you through a G search for how to rank a YouTube video. I honestly think with the recent G update, they are trying to force their adwords and YT and everything else they own to the user. So I think that the new “niche site” is going to be YT videos. I lost a ton of rankings to my niche site over the weekend. My entire website went from average 800 UV a day to 10… Really made my heart sink. Just as I was starting to do well with SEO ha ha.
Keep in mind, this will often mean shifting the focus of your business from more general to more specific products or services. For instance, instead of exclusively offering general home renovation services, you could consider specializing in "one day bathroom renos" or "custom kitchen makeovers." These more specific keyword phrases will likely be much easier to rank for, which will mean you can start ranking that much faster.