Okay kiddo, let me try to explain what estate means in a way that you can understand.
Imagine all the things you own such as toys, clothes, books, and even your piggy bank. This collection of things you own is called your property, and when you grow up, you will be able to buy and sell more things and have more property.
Now, imagine that you get older, and you have collected more property like a house, a car, some money in the bank, and maybe some investments such as stocks and shares. Your whole collection of property is called your estate, which means all the things you own at the time when you pass away (die).
When you pass away, everything you own or your estate will be passed on to the people you leave behind. Sometimes you will make a document called a Will that outlines what happens to your estate after your death.
If you don't have a will, the law will decide who gets your estate. That's why it's important to create a will so that your property goes to the people you want it to go to.
So, estate means all the things you own, and estate law is a way to make sure those things get passed on the way you want them to after you pass away.