>>1012632>>1012632Blender isn't really an engineering tool. I have used it and seen it used for visualisation work (renderings) mostly for furniture and interiors. I encounter this sort of thing from Maya/Max/C4d but a lot of this work seems to be moving to UE5/Twinmotion (others may see things differently).
FreeCAD is often suggested as a great tool to learn. I have yet to encounter anyone using it professionally,though it has its uses. It's improving but not there yet.
If you want to learn CAD you probably want to think about what sort. If you are interested in buildings / civil then AutoCAD & Rhino might be a place to start, packages like Revit might need a bit more experience but I don't know much about it. I find Rhino easier to use than AutoCAD and it has some cool stuff like Grasshopper and is good at surfacing if you are sufficiently patient. It also has its take on subd which you shoukd get to grips with quickly.
If you are more interested in product or machinery then its the default Solidworks/Fusion/Inventor etc. Some of these have personal/hobbyist editions. Solid Edge has a free version which is worth trying out for learning the basics (very capable software).
Do you have a tech background / experience?