can you help me put buildings in like 3D ish like topview gta
You have been given two examples on how to create the effect you were asking for..
If you aren't able to implement one of these two into your game and/or don't understand how they work and can therefor not change them in a way that suits you, You might not be ready to create a game like the one you want to create yet..
First you stand, then you walk, then you run, then you jump, then you fly and hopefully by that time you have also learned how to land or else you'll dive, fall and crash and start from the beginning untill you have..