As a graphic designer and urban planner I was interested to see how this was treated. It's a good start but there are some foundational concepts behind the suggestions in the video which might be good to think about. Visual communication isn't rocket science - human have a very primal approach to images; we 'read' images first as they're the easiest to comprehend, text comes second as it requires 'translation'. Use images carefully - they need to function as clearly as any text you write. Visual weight and colour function similarly - use colour and bold type sparingly to direct and signal where you want your audience's attention to be - too much and they won't know where to focus and will tune out. Lastly, your audience needs places to 'rest' their eyes, so they can consume your content - ensuring you have enough white space to balance text and images means they're not racing all over the page to try and understand all of what they're being shown. Put all that together when you're creating a document or presentation and you'll have no issues getting your point across.