Oh, one other thing I wished I knew earlier: There’s all these drawing tools in the sketcher like line and multi line and arc and whatever. And coming from something like Inkscape I thought there was a similar sort of “path” concept, but there really isn’t. Every line is just a line on its own, just with constraints from its endpoint to the end of the next line. But you get those automatically when clicking with the line tool too! So early on, if I messed something up, I’d feel the need to delete the whole “path” and draw it right. Dumb. Just delete whatever line you need to delete, draw any other lines with any tool makes sense, and it’ll be equivalent. Just do whatever, the system doesn’t care and can’t tell them apart anyway.

Obviously if something downstream is depending on the position of that line that might mess up those constraints, but that was more likely to happen when deleting all the lines rather than just the one problematic one I forgot to make as a curve or whatever.