Default [Q] How i can mod game android

For the first,, sorry if im break rule number 6 from xda rule,, or im make wrong thread
But im here just for study,,

How i can mod game like money,ammo,faster duration, etc,,??

May someone give one guide for that??
But without IDA or anything about computer,,
I like mod anything in my android phone,,
Like extract apk, edit some .xml code, and compress again to apk,