This is the second post of a series of four where I’ll show the main steps I followed to build Flashcards, a single page app that will help users study and learn any subject they want through spaced repetition. Part 1 - The back-end Part 2 - User authentication Part 3 - The front-end Part 4 - Deploying to Heroku and GitHub Pages The back-end is a Rails app that will store the information provided