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In Projects, you can keep track of your progress as you go throught the tasks. Check each item as you complete it!
Many web apps let users sign up for a new account and log in and out of their accounts. Together, signing up, logging in and logging out make up an authentication system.
Let's create an authentication system for a photosharing website built with Ruby on Rails.
If you're new to Rails, we recommend you do this course first.