I have used SketchUp on my iMac Pro for years, and I am having editing problems on the iPad version that should be really simple. I guess a general question would be…is there a more comprehensive manual available someplace?
How do you remove one edge of an entity?
How do you cut a line into two segments?
How do you draw editable breezier curves?
How do you add a freeform line to an existing line?
Besides treating it like normal geometry (scale, move, rotate, etc…) the only way I can see to do minute changes is to select it and explode the curve, but then you’re going to get a billion and one little segments. I usually treat it like a finishing tool. Last second edge changes for texturing, and basic shape cutting (I always use the freehand tool on a surface to keep the lines coplanar).