Absolute plebe here.
When I looked up if it was possible to move/copy sites to another site, an answer here helped but led to another question.
The solution was to use "http://yoursite/_layouts/sitemanager.aspx"
AFAIK sitemanager.aspx is NOT in 'site settings' (settings.aspx) nor did I see that anywhere else.
Such a useful page like sitemanager isn't easy to find. I'm wondering if anyone has already collected all useful links like "/_layouts/sitemanager.aspx" so I can see what I'm missing out on because apparently I missing out on a lot.
Per my title, any combination of "sharepoint online layout links" or what have you does not give what I'm looking for since "layout", "links", etc are it's own topics.