Two ways to learn about architectural drafting and computer aided design for free are through MIT’s OpenCourseware and through the online courses from Lydia.com. The Architecture department at MIT is the oldest in the United States and attracts expert teachers internationally.
MIT’s OpenCourseware gives students access to free course materials including the syllabus, assignments, lecture notes and projects for an “Introduction to Design Computing” course. The in-depth class teaches CAD drawing and 3-D modeling; the assignments focus on creating computer models of a different building each semester.
Lydia.com offers short, three-hour courses in ArchiCAD and SketchUp, two widely used 2-D and 3-D computer programs for architectural renderings. The site offers an initial free trial after which there is a fee for the courses. Students download exercise files that augment each section, broken into short, interactive audio and video segments.