Hi Ken, I'm glad you've made good progress!

re:
> 1) If you're drawing a curve freehand, the points of the line are /guides/.

It depends on which particular freeform curve drawing tool you are using - if you use Draw curve > Freeform > "Control points", then it works like you're describing. If you use the one next to it that says "Through points", then it will behave differently and the curve that you draw will be forced to go directly through the points you pick.

But often times it's more difficult to get pleasant shaping when forcing a curve through many points, the control points method where the curve is generally guided by the hull of the points you pick tends to make a more gently curving shape.


> 3) Out of the box, the app doesn't enforce units. When sent to other folks, this will appear as
> mm, so something I meant to be 30cm was actually 3cm. After settings the units, it's now in
> cm, so should measure the right size.

Yeah the very original default will be "No unit system", and some CAD programs do not have this concept in them and may interpret it as mm or inches depending on which file format you use. But yes if you need things at a particular unit size make sure to set the current unit system under Options > General > "Unit system". You can also change the default for startup under the "Unit options" button on that same spot.

- Michael