I haven't seen a giraffe in a while; these animals are such wonderful creatures. Please take a good look at their patterns; while looking at them, I have come to realize how beautiful giraffes are.
Looking at the site, I'd say that some of the information are well described. Still, a lot of people get confused on the box model might as well on the flex box, grid and manipulating transitions and animations.
I do think that all of us have a different take on how we should learn stuff quickly. Some of us learn through visualization; some of us learn by doing the stuff itself. It's just a matter of finding the best method for you to learn different things.