I think that if anilkumble has no knowledge of the terms or physiology of what he is asking it will be hard for him to make a well thought out question. So instead of belittling him we should hep him figure out what he wants to know.
Anilkumble, You asked what major areas you need to target (Butt, Thighs, and Legs) in each region. Did you mean exercises? You have four major muscle groups in your legs. Your butt (glutes), the front of your thighs (quadriceps), the back of your thighs (hamstrings), and back of your legs belos the knees (calf muscles). There are also supporting muscle groups on the front of your hip (hip flexors), inside (addductors), outside (abductors), and beside your shin (anterior tibialis).
I hope this helps you make a more concise question.