I've only just begun using FreeCAD (and CAD in general, especially parametric CAD), but one of the problems I've seen when sketching on a plane has been the top

I've only just begun using FreeCAD (and CAD in general, especially parametric CAD), but one of the problems I've seen when sketching on a plane has been the topological naming problem[0]. I don't know how it's changed since 0.19, but basically, making changes to your model after sketching on a plane can cause the sketch to anchor to another plane instead. I was fist introduced to this problem in a video[1] made by Flowwie, who makes some fantastic introductory videos for FreeCAD. I'd strongly suggest watching it, because this isn't something the tutorial on the wiki[2] warns you about. Flowwie goes on to suggest an alternate method of working around this problem which works by using reference measurements (measurements within a sketch that aren't specified, but calculated for use in other sketches). [0] https://wiki.freecadweb.org/Topological_naming_problem https://wiki.freecadweb.org/Topological_naming_problem [1] https://youtube.com/watch?v=FVKhejma69U https://youtube.com/watch?v=FVKhejma69U [2] https://wiki.freecadweb.org/Creating_a_simple_part_with_PartDesign https://wiki.freecadweb.org/Creating_a_simple_part_with_Part... [edit: I accidentally linked to a video I didn't mean to link to! This one is the one I intended.]