If some useless sites keep polluting your Google or DuckDuckGo search results, and if you use the "ublock origin" extension, you can exclude them:

Source: krono's comment on HN: https://news.ycombinator.com/item?id=31693787

To block results from specific domains on Google or DDG:

google.*##.g:has(a[href*="thetopsites.com"])
duckduckgo.*##.results > div:has(a[href*="thetopsites.com"])

And it's even possible to target an element's text content with a :has-text(/regex/) selector:

google.*##.g:has(*:has-text(/bye topic of noninterest/i))
duckduckgo.*##.results > div:has(*:has-text(/bye topic of noninterest/i))

As a bonus, here's how to get rid of Medium's obnoxious cookie notification across all domains:

*##body > div > div:has(*:has-text(/To make Medium work.*Privacy Policy.*Cookie Policy/i))

https://youtu.be/GL5shUpBdno

Thanks to Erfan for sharing

https://spacemath.gsfc.nasa.gov/SMBooks/AstrophotographyV1.pdf

A Guide to Smartphone Astrophotography