Blender
Blender is a free open source program that has features for 3d modeling, rendering, and animation. I spent some time learning the basics and have made a few things I ended up really liking.
Procedural Doughnut
When I was first starting out I saw all those doughnut tutorials but never actually did them. after a while I got really into procedural stuff and tried remaking it with only procedural nodes. only the sprinkles are not procedural.