This question already has an answer here:
We have had quite a few questions regarding Minecraft mods, some along the lines of "Mods crashed. Halp". A lot of these get closed, which is understandable. Unmodded Minecraft crashes are hard enough to solve without the right information, so modded Minecraft packs make it infinitely more difficult.
However, (I can't recall the specific question where I read this) I saw a comment saying "We don't allow modded Minecraft crash questions" (for the above mentioned reasons, among others). Though I have seen plenty of questions involving forge crashes, specific mod crashes, etc.
So what precisely do we allow in terms of Modded Minecraft support?