This is the Pencil tool, this is used for free hand drawing. It will automatically create lines which have anchor points and curves if that’s what you have drawn.
The next tool is the Smooth tool and this will smooth out the curves in a line while removing the anchor points of the line. If you look at our example you will see that the curves are a lot rounder then the previous version.
The Erase tool will remove the part of the line you draw around. You can see here that we have used it and now are shape is incomplete.