Blender is the open-source 3D suite that has gone from "free alternative" to "industry tool used by Disney and Ubisoft" in roughly a decade. The 2.8 release in 2019 modernized the UI; 4.x brought the Cycles X path tracer, geometry nodes, and a serious sculpting toolset. It now covers modeling, sculpting, UV unwrapping, texturing, rigging, animation, simulation, and rendering in a single application.
Most courses split by specialty: hard-surface modeling for product / game art, character modeling and sculpting, motion graphics, architectural visualization, and the procedural geometry-nodes workflow that competes with Houdini for parts of the VFX pipeline.