If an investment goes up 10% it has gone from 100% (at the start) to 110%.
If that same investment goes up another 10% it goes from 110% up to 121% (10% of 110 is 11)
So if an investment goes up by 10%, then that goes up by another 10% it’s gone up by 21% (not two lots of 10% i.e. 20%)
That’s compounding.
In the first year you get the growth on the money. In the second year you get the growth on the money (again) and the growth on the growth. The next year you get the growth on the money (still) AND the growth on the growth and the growth on the growth on the growth
This just keeps going. The longer you leave it, the more the growth on the growth adds up.
All you need is discipline and time
Compound interest is the eighth wonder of the world, set yourself up to benefit from it not battle against it