Asked this question the other day but the constant 404's are making me nervous. Rebuilt from scratch a website for someone whose website person stopped responding (they also used wordpress). In the process some picture names changed and some articles over a few years old weren't recreated on the new site. I'm not worried about 410 or 301ing these type of 404 errors.
What I really want to know is when I get 404 errors on stuff like the below, what should I be doing? Ignoring them? Marking them as deleted because maybe they were in a different directory? Not sure if I should be redirecting php or css files, I don't want any system files to be impacted by my saying content deleted, but I also don't want my SEO rank to get crushed by all of these 404 errors from usability. I see all of these 404 errors constantly populating in my RankMath log.
wp-admin/admin-ajax.php
wp-content/uploads/uag-plugin/assets/12000/uag-css-11872.css
log.php
options.php
No don’t redirect system URLs. And you don’t need to redirect 404s if the page no longer exists. Thats what’s supposed to happen and helps Google update their index. Despite what most people think, 404’s don’t hurt your seo https://developers.google.com/search/blog/2011/05/do-404s-hurt-my-site