I have tried to use the open source CAD programs, but they never worked that well for me.
SketchUp is good, for what it is, but again it’s never been for me.
If you want 2D like AutoCAD then I have found SolidEdge from Siemens to be good. There is a free version, and I think a paid one too. I only used the 2D version but a quick search just now seems to show a community edition of the 3D too.