Basic Variables:
int = integer = 1,2,3,4,5 and so on
real = real value = 1.00, 1.01,1.02,2.01, and so on
boolean = True or False, usually used to return a condition like..
int a = 10
if a > 5
return true
else
return false
endif
thats a simplified function
objects can also be variables, such as units, unitgroups, players, items, etc.
Its very basic math. If you passed elementary school you should be able to get it.