Amazing, I was not born in that era but it makes me feel nostalgic too. How does on go on to learn to make animations like this?
https://www.freecodecamp.org/news/drawing-on-a-canvas-elemen...
From there, you'll need a good understanding of loops, control flow, data structures like arrays to store the pixels, lines, shapes, and colors, wiping and redrawing the screen between "ticks" (a single pass of the main loop), and refresh timing to control the speed of the animations.
On a side note there's actually a refresh bug in my plasma demo I just noticed a moment ago... if you leave it open for too long on plasma it starts redrawing faster and faster until it looks like glitch-art!