If we're talking about design, I'd argue that "show" is a few orders of magnitude better than "tell." This goes double for when the article begins talking about color usage.
> 3. Colours is the single most important thing of design
The most important thing!? Then why does this section sum up to
A) Use good colors B) Don't not use good colors.
This is a section ripe for a couple of visual examples, man! Are certain color combinations the equivalent of Comic Sans?
>Just a tip here: not all palettes work well for a presentation. Firstly, some palettes have too much contrast.
I have no idea what that means. Is Black on White out? That's about as high contrast as you can get -- and that was my go-to. Could a guy get an example of too much contrast? Too low contrast?
Help a guy out! :)