• Needs the pg gem as heroku uses PostgreSQL
• Install heroku cli
• from command line, run heroku login -i, enter email and then enter authorization token (found at Account settings -> Applications) as password

• for dev and test & env, sqlite3 database and for prod, prostgresql is used (see config/database.yml)

• to create scffolded model: rails generate scaffold <Model name in plural form> <attr1:data_type> <attr2:data_type>...<attrn, data_type>
• open console: rails console

Following the tab;e

• Creating controller, e.g rails generate controller StaticPages home help, where StaticPages is the controller and home and help are action methods
• Creating model, e.g rails generate model User name:string email:string, where User is the model and name, email are the attributes
• Destroy controller/model, e.g rails destroy controller StaticPages home help/ rails destroy model User
• DB migration, e.g rails db:migrate
• We can undo a single migration step using, rails db:rollback
• To go all the way back to the beginning, we can use, rails db:migrate VERSION=0

• If the ruby version is <3.0.0, update ruby with rbenv
• From command line, run, bin/rails server