[Wordpress] the selected plug-in does not meet expectations, how to modify it in the correct way to open it?

I"ve never used WP, before, but I recently tried to use it, but I found that the idea of this is rather strange.

when I select a plug-in to add some functionality to my page, but there is a gap between this plug-in and what I expected, but no matter how it is configured, it is not in line with my desirability. It"s like changing the code of the plug-in directly (anyway, it"s all local). But I always feel that there is a big problem with such a revision.

on the one hand, it is more difficult to change, and on the other hand, if you accidentally reinstall the plug-in, isn"t it over?

so I would like to ask experienced Taoist friends, how to solve this problem in general?

Mar.11,2022
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-64f5-1e52534-657bc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e52534-657bc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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