This documentation is not finished. Please help and contribute documentation.
Gui Command explains how tools should be documented. See Draft ShapeString for an example of a well documented tool. Browse Category:UnfinishedDocu to see incomplete pages like this one. See Category:Command Reference for all commands.
See WikiPages to learn about editing the wiki pages, and go to Help FreeCAD to learn about other ways in which you can contribute.
See Mesh EvaluateRepair