Yes, everything is simple and difficult at the same time.
Basically, there are 2 exercises for the development of the buttocks:
1. Squats - the deeper the squat, the better. the main work of the buttocks when performing this exercise is precisely with the position of the legs from parallel to the floor and below. This exercise develops the buttocks "back". I don’t know how to describe it.
2. Bending forward, it is desirable to bend the legs slightly or keep straight. This exercise develops the buttocks in width.
The main thing is to constantly increase the load, and do 10-15 repetitions. So that in the last repetition of the exercise you will have strength for another 2-3 repetitions. And such 3-5 approaches.
I would advise you to download the Butts workout application or other thematic applications from the google play. A big minus of homework is an unprofessional approach to business, the expectation of an ideal result in a week or two and unsystematicity. This application will allow you to choose a training program that suits your level of physical fitness, you can easily track your progress, and most importantly, reminders will not let you forget to devote 20 minutes a day to your gorgeous ass :-)