When you first log into the app, it asks you things that you like, for example, cooking, makeup, fashion, pets, working, traveling, nature, etc. You select the ones you like and your feed will be full with content of things that Pinterest might think that interest you. Whenever you find ideas that interest you you, you can save them into different boards (folders). You can have up to 2,000 boards and many sections inside of it. Every time you search, save, like or share something on Pinterest, your feed will adapt to show you similar things to it, since the app uses self-learning techniques to show you interested in ideas or pins like those.