Additions

[beejjorgensen]

• Anonymous Enums
    https://stackoverflow.com/questions/7147008/the-usage-of-anonymous-enums
• Star Modifiers
    https://stackoverflow.com/questions/17371645/
  why-use-an-asterisk-instead-of-an-integer-for-a-vla-array-parameter-of-a-f
    https://stackoverflow.com/questions/38775392/
  what-does-star-modifier-mean-in-c
    https://stackoverflow.com/questions/7225358/
  prototype-for-variable-length-arrays
• scanf Character Classes (Regex)
    https://stackoverflow.com/questions/766516/
  what-is-the-purpose-of-using-the-notation-in-scanf

I also noticed that you talk a bit about pragmas, but don't mention a
common (but not standard) one, "pragma once", and how they can be used
over include guards.

[hueychen27]

I also opened an issue on including sigaction usage too.

[OpenBSDude]

Added one on function pointers