Want, WantedBy, Before, After etc -

Emscripten is a complete Open Source compiler toolchain to WebAssembly. Using Emscripten you can: Compile C and C++ code, or any other language that uses LLVM, into WebAssembly, and run it on the Web, Node.js, or other Wasm runtimes.

Main man/doc page of systemctl

Misc good links for emacs

Good guide and doc for Bash arrays. Also clearly states difference between array (indexed array=list) and associative array (keyd array=map)

Great summary of org-babel especially all the tricky header variables.

Core site for Material design documentation

Example of testing a Flutter app.

Best overview of PlantUML

Descibes vnc

Good document on what is what in rooting with detail steps, but too generic.