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I was in the same place you are, brushing up on CAD w/ a 3D printer. OnShape is a web based CAD service from some of the original technical creators Solidworks. I found that going through their tutorials helped a lot in understanding how the tools think.

Not open source like the other options discussed here, but free for hobbyists.

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I too started with freecad, abandoned it because of bugs. Switched to fusion 360 and then now I am using onshape.

The productivity gain goin to fusion was about 10 fold. I think onshape is even better tho. I particularly like the assembly system.

The assembly system is very nice. Once I learned you could enter variables and equations into most of the operations & constraint fields in OnShape, my ability to model in it became much better. It's great for placing multiple symmetric attachment points onto parts to construct assemblies for example.

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