TIL, 2017-08-21

TestProf. Reference
Man tests are just so good. 94% of Ruby developers do tests so I would suggest doing tests always. :)
Youtube Error is due to The Great Suspender: Reference
The %20 is not relevant when doing a GET, you do things like this: localhost:3000/api/v1/users/courses/search/?name=Blue+Hill.
Postgres, you can create indexes on expressions.
CITEXT is case-insensitive text, a possible column type.
The creating your own API to your own app so you can access things faster.
before_action, the action must be right it will silently fail.