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I started with this basic idea that anyone should be able to do this, and how can we simplify sketching using a basic set of elements and language that anyone can use.
These are some ideas that I found from Dan Roam, John Landay, and Dave Gray. The idea being that once you have these basic elements, a few forms, and some arrows and lines for flow, then you have the tools you need to express any idea.
This is all you need to learn to start to communicate visually with a sketch.