A stable, referenced building model.
The "28" structure suggests a day-by-day or topic-by-topic approach that is highly effective. Instead of overwhelming the user with the entire Revit interface at once, the tutorials break the learning process down into bite-sized pieces. revit+mep+tutorials+for+beginners+pdf+28+work
Learn to use offsets to ensure electrical runs don't clash with plumbing or HVAC. 4. Plumbing and Piping Plumbing requires a firm grasp of Slopes . A stable, referenced building model