OpenSCAD

You use OpenSCAD when you want to design logically and parametrically and not look up to simple code. It fits especially with technical shapes with repeatable dimensions.

Choose between the stable release and a development version. Open an example, save your own script and run a final rendering for export.

Your scripts and models can stay local. Downloaded libraries and shared designs may need additional files; view the content before you include them in a project.

You describe geometry with code instead of modeling everything directly with the mouse. Complex combinations can require a lot of calculation time before the final model is finished.

Do not confuse a development napshot with the stable execution. Check wall thicknesses, units and the exported model before starting a long print job.

OpenSCAD is especially useful for designs that you want to systematically vary. For organic forms it is less self-evident, but for fixed parts the textual approach is clearly verifiable.

The textual approach is particularly beneficial if the same part with other sizes has to be recreated. Variables for width, height and wall thickness make such changes explicit. Then check the final model and export in your follow-up tool, such as a slicer. For designs that you especially want to shape on feeling can be code limiting. For systematic variants, it helps to find and re-apply choices.