Prototyping is key to effective engineering and product design, and a common maker activity among MIT students working on and refining their designs. Find a few key prototyping resources here, and let us know if you'd like to see something added. And prototyping is intimately connected to making. (Not all making is prototyping, but all prototyping is making.)
Watch this excellent MIT BOOTCAMP recording of Dr. Nithin Kantareddy's 1-hour workshop on how to Prototype Your Product Idea.