I recommend https://www.sandimetz.com/99bottles/ https://www.sandimetz.com/99bottles/ to everyone. Also her other book, Practical Object Oriented Design in Ruby

I recommend https://www.sandimetz.com/99bottles/ https://www.sandimetz.com/99bottles/ to everyone. Also her other book, Practical Object Oriented Design in Ruby. They both communicate the essential points very clearly. Also, after reading those books I got a better idea why OOP has a bad reputation, and why people are so bad at writing tests. Somehow these skills are presumed to be easy and already there when in reality they need practice, a lot of it.