How do rss feeds (such as rsshub) apply to your own projects?

beginners learn the concept of rss, although know that rsshub can get a lot of website content, but read a lot of related blogs are to recommend some rss readers for their own use,
if you want to make this into a function in their own app/web, (similar to instant? (what do I need to do?

Rss
Jul.01,2022
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bdbaba-31282.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bdbaba-31282.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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