RGSS scripting dissections and explinations

[Siletrea]

WHOOT! this is turning out to be one of the best tutorials I've ever gotten! this is helping to make other tutorials make some sense while still being overly helpful in its own right! THANK YOU 

BUT as usual if ya don't mind I gots a few more questions!

R,G,B,A? shoudent it be R,G,B,L as in Red Green Blue Luminescence/Light whats the A mean?

and loops?
they use the "for" comment right?

for blah do blah:
    else do blah

I have no idea if that's right I'm guessing

and ( ) is most common and is used for math or image placements or colours?
while [ ] is used exclusively for lists of numbers in "arrays/hashes/strings"?
lastly { } is overly technical and is used for massive configurations and overly complex stuff...like the Dancing Mini Game your making that's totally brilliant!

and hashes can hold a buttload of "Arrays" which are the boxfull of numbers in a list that can organize stuff?

what about : ; , ! is there specific places and uses for them?