Okay kiddo, so a coat of arms is kind of like a special picture that represents a country or a family. It's usually on flags or buildings or uniforms or things like that, to show that they belong to that country or family.
The coat of arms of Slovakia has a few different parts to it. The top part has a white double-cross on a red background. This is a very old symbol of Slovakia, and the double-cross has actually been used for hundreds of years. It represents the Christian faith, which is very important in Slovakia.
The bottom part of the coat of arms has three green hills on a blue background. The hills are meant to represent three of Slovakia's big mountain ranges - the Tatra, Fatra, and Mátra ranges. The blue background is like the sky, and shows that Slovakia is a pretty country with lots of nature.
So, when you look at the coat of arms of Slovakia, you see the important symbols of the country - the Christian faith and its beautiful mountains - all combined into one special picture.