Nobody knows all the coding (except maybe Deezire

)
Just experiment, make some crazy units, so on...
Most of the coding lines are pretty obvious, and other times EA tels you what it means (atleast they did 1 thing right)
On another note, I understand that you are new to this modding thing, and that you want to find out what everything means. You are making a lot of topics and asking questions that have been answered before. Everybody does this, but you know, use the tutorials, SEARCH function and so on...
Modding can be hard and frusturating at the start (I actually quit modding when I first tried to learn it 2 years ago, but then came back).