There are a few good compilations of documentation on various of the major subjects. There isn't really any organized collection, other than the
man pages. You've already touched on the
dd thread in these forums, then there is the famous
Advanced Bash-Scripting Guide. Generally, the more expanded and tutorial documentation is published in various ways and locations. A Google search that includes the words 'example', 'tutorial', or 'FAQ' frequently turns up highly relevant content. Most of the documentation you describe evolved organically over some time, frequently with multiple contributors. The now less used Usenet groups were once a strong organizing force, and each one tended to have it's FAQ, many of which live on to this day, although there is a lot of outdated content from those origins, as well.
--- rod.