if you know what your doing then no. But if you have no clue .jar means the you don't want to do it.
if you download the wrong minecraft that is the 1.2.3.4.5.6.7 0.37
no, aether is part of a mod and there is not really been any moding for xbox as far as i know
Squids can't hurt you in Minecraft.
moding download find it in youtube only in computer version
Minecraft doesn't mess up your computer. Minecraft is a malware free program.
no you can not
Minecraft is made to work with ANY computer that uses java.
no
minecraft cost 7.99 or 6.99 for any computer
So far no
Online at the Minecraft website
Yes, you can log into as many minecraft accounts on one computer as you want.