Learning curve means how easy or difficult it is to learn something new. Imagine you are playing with blocks for the first time. At first, it might be really confusing and you might not know how to stack them properly. It might take some time to understand how to build a tower with the blocks.
But as you keep playing with the blocks, you learn how to stack them in a better way. You might start building more complicated structures, like a bridge or a castle, because you have become better at building with blocks. This is like your learning curve - it is the improvement you make over time as you practice and learn more about something.
The learning curve might be steep at the beginning - meaning you may have a lot to learn and it might be difficult at first. As you progress, the curve becomes less steep - meaning it gets easier to learn and understand new things. Eventually, you might become an expert at building with blocks and be able to construct incredible structures without any help.
The learning curve applies to many things in life - whether it is learning how to ride a bike, cooking a new recipe, or studying a new subject in school. The more you practice and learn, the better you become and the faster you can learn new things.