Once you begin a course you'll be able to track your progress, access the discussions and add resources to this topic. Learners are also teachers; as you take this course, add resources and discuss topics you strengthen the program for anyone who takes it after.
Prototyping is a fast way to test out any idea. Without having to spend the time and money to actually build it, you can get 80% of the way there with a quick and dirty prototype. Test it with people who would use your product and see what works. If your idea fails, know that you saved a lot of headaches had you gone to build it that way.
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I'm a big fan of design sprints...
Design sprints are a way to answer critical questions during a five-day process where you design, prototype, and test ideas with customers. Originally developed at GV (Google Ventures), design sprints use human-centered design and design thinking principles to get you started.