I don't know solve space, but I can not not recommend FreeCAD enough.

Have trouble parsing that sentence? Now image that level of mental gymnastics for everything you're about to learn in FreeCAD. Don't do it.

I am a FreeCAD fan, but I learned on AutoCAD and others way more polished before I ran into it. If FreeCAD had been my intro to CAD I would not have continued. They're doing great things but it is not entry level ready. To use and continue to use FreeCAD you have a special kind of blind spot for some of the less intuitive workflows, and it's tendency to randomly lose its fucking mind and turn your project into a mangled, inverted abortion of its former self and then forget what Ctrl+Z is.