Most probably they look just like you and me. A cyber attacker, or cyber criminal, works in an office or home similar to us and they have a goal of making money from the access they got it. The new normal is a phrase we hear a lot at the moment, and unfortunately, endemic cybercrime is the new normal.
Writing clean code is important because it allows you to communicate clearly with the next person who uses what you write. Being able to go back to previously written code and understand its purpose is the key, especially in the field of Software Development.