Fun building a 3D scene with just Three.js primatives e.g with just built in geometies like SphereGeometry and BoxGeometry. You can get pretty far.

Learnt about how to make high fidelity animations with theatrejs. First time i have seen a UI in conjunction with code to build animations. It actuall makes a lot of sense! It combines the best bits of dat.gui and GSAP to create an intuitive animation authoring experience.