Tic Tac Toe (or noughts and crosses) is a good game to create when learning game development as it has simple rules and a known win state.
A pie chart is a great way of showing the relationship between numbers, especially when showing percentages. Drawing a pie chart from scratch takes a fair amount of maths to get working and so people usually go for third party charting libraries in order to add charts to the page.
In this article I will look at setting up Nightwatch.js in a project and getting started with writing tests.
The Marp suite of tools is great for creating presentations from simple Markdown rules.