Lill's method is a way to check if a group of numbers come from a normal distribution. A normal distribution is like when you have a lot of numbers and they are kinda evenly spread out like a bell shape.
To use Lill's method, you need to do a few things. First, you put all the numbers in order from smallest to largest. Then, you need to calculate some special numbers using a formula. This formula looks a bit scary, but all it does is use some math to figure out if your numbers are from a normal distribution.
After you calculate these numbers, you compare them to some other numbers that someone has already calculated and wrote down in a table. If your calculated numbers are bigger than the ones in the table, then it means that your numbers are probably not from a normal distribution. But if they are smaller than the ones in the table, then it's more likely that your numbers are from a normal distribution.
So, Lill's method is just a fancy way to check if some numbers are from a normal distribution or not. It uses some math and comparison to do this.