leran to hack

i want to learn how to hack rotmg

example:
make my own client with aimbot....

which tools (eclipse... ) and coding language (java, c#...) i need to learn??

every link to other websites or link to old posts which helps me is helpful

sorry for my english i am a german user

Learning to hack in general isn't something that commonly takes a day to learn. For some people it would take weeks, for some people it would take years.
I suck, so I'm not much of a help, however I'll step up and say you shouldn't be requesting links to 'other websites'.