Very smart single page website design. Nice responsive solution too. I like the monochromatic/underplayed colors too, it sets the tone for a nice laid back expectation from these lessons.
Microinteractions
Microinteractions are subtle site animations enhancing engagement. They include triggers, rules, feedback, and sometimes loops/modes. Practical uses: improving engagement, guiding user behavior. Well-designed microinteractions boost user engagement and your online presence.
Wonderfully simple & to the point.