Population Graph created in the MOOC course by Sympa: Web Coding for Beginners.
Got the course certificate on April 2, 2020.
Before the course I knew HTML and CSS but hadn't really done much with JavaScript (apart from little code snippets I used in onClick attributes decades ago). It was really interesting to learn how to use open data through an API (World Bank). Chart.js was a nice visualization library to use, too.
This little course lured me into learning more JavaScript because it bothered me how little I was able to customize the code itself.