Section
Theming
Themes are the oldest reason people take a Linux desktop apart, and the least explained. Here: where icon and cursor themes actually live, why half your applications ignore them, and what a theme has to contain to work everywhere.
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X Vs Y
Why GTK and Qt Applications Never Match, and How to Make Them
Which configuration file governs which family of applications, and the specific bridge packages that work
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Decode A Document
Where Icon Themes Live on Linux: /usr/share/icons, ~/.icons and index.theme Decoded
An annotated index.theme, the search path in order, and the cache command that has to be run afterwards
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What To Do If X Failed
Icon Theme Installed but Nothing Changed: The Checklist
A diagnostic order that ends with the exact reason rather than a list of things to try
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Norm/Table
Which Icon Sizes a Linux Theme Actually Needs, and Which Nobody Ever Sees
A size-by-use table with the fallback behaviour when the size is absent
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What To Do If X Failed
The Mouse Cursor Stays Default in Some Applications: Why, and the Fix per Toolkit
One table of the source of truth per application family and the setting that overrides it
Older material on this domain, including sponsored placements, lives in the archive.