Imagine you are playing with blocks, and you have a big block and a small block. The big block is the main block and the small block is like its little helper. When you play with them together, they make a nice sound that you can hear.
This is kind of like how a scale of harmonics works. When you make music, you use different notes that are like different blocks. But sometimes, you can also play two notes together and they make a special sound called a harmony.
The scale of harmonics is like a list of all the different harmonies that are possible. But instead of using words or letters to describe them, we use numbers. So, it goes like this: 1, 2, 3, 4, 5, 6, 7, 8, and so on. Each number represents a different kind of harmony that two notes can make when played together.
Just like some blocks fit together better than others, some harmonies sound better than others. And when you put all the harmonies in order, you get something called the scale of harmonics. This can be useful for musicians because it helps them know what notes will sound good together and which ones might not sound as nice.