I think I have cracked the whole plotting idea or what it means (although I get insights like this every week, thinking that THIS IS IT).
It's simple. Each of your characters wants something. That "want" is one plot. The more experience you get, the more characters you can handle, with more of their "wants." For example, you might have only one character (like in Hemingway's The Old Man and the Sea) with one want, to catch that damn fish. Or you can have two characters, Molly and Danny. Molly wants a lover, Danny wants a job. But, you can also have Molly want a new pair of shoes. Or not. It depends on how many things you can hold in your head. You will have to close them all at the end. Molly will either get a lover or not, get shoes or not.
My first books are plagued with this issue. My characters have too many wants and I lose track of them. Now that I understand it, I will write cleaner. It will also help me get unstuck, because you get stuck when you don't know what your character wants.