Don't use “it’s simple” to explain something.
When reading tutorials and watching presentations, I often come across this sentence: "it’s simple!". The author uses that sentence to introduce an idea and explain something. I think "it’s simple" shouldn’t be used to explain anything.
Using "it’s simple" didactically means:
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I am enthusiastic about the topic.
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You can understand what I’m explaining.
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There shouldn’t be any disagreement about what I'm saying.
But saying “it’s simple” can:
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Undermine the listener’s efforts.
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Set false expectations.
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Imply that anything less than immediate understanding is stupid.
Examples
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"Category theory is about something very simple: composing functions." Philip Wadler. Category Theory for the Working Hacker (YouTube, 9:23).
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"Go is not a small language but it’s a simple one." Rob Pike. Keynote: The Expressiveness of Go.
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"As you can see, the JavaScript involved is extremely simple." Sara Vieira. Building 3D in the Browser with Three.js.
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"This is the kind of formulas that I’m talking about, you know, really easy to understand." Leslie Lamport. Heidelberg Laureate Forum Lecture (YouTube, 15:44).