woah really? i'm sorry i didn't mean to offend you D:
then i'll explain it better, you have lots of programs you can use, photoshop's maybe the most popular, but it always depends on what's better for you and the kind of picture you want to get, i used to only use SAI since for me it was easier. Most of the pictures i posted are done using SAI.
Anyway i'm still not quite satisfied with my digital works, so it's not that i'm an expert xD