Since my browser removed the two-click feature for sending a site's feed URL to my RSS reader, I now do a bit more manual work to find RSS URLs myself.

Twitter lost its native RSS support, but Nitter provides RSS links. Example: https://nitter.net/eff/rss

Reddit provides RSS for most listings, including search results. All you have to do is append .rss to the path part of the URL. Example: https://old.reddit.com/r/hackernews/search.rss?q=web&restric...

GitHub provides Atom feeds in various places. Example: https://github.com/drwetter/testssl.sh/releases.atom

When I don't know if a site offers a syndication URL, I fall back to viewing the page source, and searching for these telltale strings: <link rel="alternate" type="application/rss+xml"