Ooohh - I'm sorry! I guess I've got a lot on my mind today. I'll make a new video, and I'll be right back.
Edit
Ok, I edited the same video, in my last message above. There are a few more steps now. I think I forgot to say before, but you can hold the shift key to allow you to select multiple nodes.
In some places, where you can see I move the mouse over the edge of the line, back and forth. I'm doing that to show that when you see the little hand pop up when the mouse crosses the edge, that indicates there is a path there. It's a little tricky to edit this particular image, a closed path with a fill and no stroke. Without the stroke, it's hard to see where the actual path is. But moving the mouse over the edge can tell you if the path is there or not. Then you can see in the section where the little hand does not show up, there is not a path there.
When I was first learning to do this kind of editing, I would always remove the fill and add a stroke, so I could see the actual path, and know for sure what I was doing. Now that I think of it, I probably should have done that, to show you. But I guess the video is clear enough.
But let me know if you have any questions