When we write code, it's crystal clear to us what it does, but this won't be the case in a few months when we might have to change it again.

This is why it's good practice to place comments in the code where we explain what different parts of the code do.

When we work with any sort of program, we need to save our files regularly to our computers. Afterwards, if we want to work on an old file, we need to load it from the computer.

Now we will learn how to do that in Scratch.