Okay kiddo, let me try to explain the economy of Kazakhstan to you in a way that you can understand.
So imagine you have a bunch of toys, and you like to play with them. Sometimes, other kids come over and ask to play with your toys too. You can either let them play with your toys for free, or you can ask them to give you something in return, like a piece of candy or a sticker.
Well, Kazakhstan is a big country that has a lot of things that other countries want. For example, Kazakhstan has a lot of oil and natural gas in the ground, and other countries need those things to run their cars and factories. So, Kazakhstan can sell some of its oil and natural gas to other countries, and in exchange, those countries will give Kazakhstan money or other things that it needs.
In addition to oil and natural gas, Kazakhstan also produces other things that people might want to buy, like grains and metals. By selling these things to other countries and getting money in return, Kazakhstan is able to build schools, hospitals, and other important things that the people who live there need.
Of course, there are other factors that can affect the economy of Kazakhstan, like the price of oil and natural gas on the world market, or how much demand there is for the things that Kazakhstan produces. But in general, it all comes down to Kazakhstan having things that other people want, and being able to trade those things for what it needs to make its people happy and healthy.