Actual bit sizes in Unity for [char, short, int, float and boolean] (Windows, C#)

I thought I'd do some research on variable Type sizes before starting to program my Network.
But hell, is it confusing...
What I learned so far: it seems to be platform and language dependant.

I found varying informations about it on Wikipedia,
where a short data type for example, could range from 2 bit to 16 bit...
https://en.wikipedia.org/wiki/Integer_(computer_science)

#1 So does anyone know more about this...

Actual bit sizes in Unity for [char, short, int, float and boolean] (Windows, C#)