Steps

In replit.com, you can always find the files window on the left hand side it should show the directories of your app in a tree structure:

You can see that the template created a lot directories and files. The ones we want to focus on today are:

File/Folder	Purpose
app/	Contains the controllers, models, and views for your application. You will do most of your work here.
config/	Configure your application's runtime rules, routes, database, and more.
db/	Shows your current database schema, as well as the database migrations.
public/	The only folder shown to the world as-is. If you put files in here, they will be served directly on the web without any processing by Rails.

There is a lot more that in your Rails app. Probably enough to fill a book, so we're going to ignore them for now.