Clean Code with Java examples

This is a big preview of my "Clean Code with Java examples" course.
You can also learn there about:
Low Coupling, High Cohesion
Command and query separation
Tell don't ask
The law of Demeter
How clean code influenced MVC
Single responsibility principle
Why empathy is important when programming
How many lines should a small function have
Programming line length
Clean code and Exceptions
Symptoms of bad code
What is state in programming and why it's important
Test pyramid and test driven development
How over-engineering might seem like a solution for bad code but it isn't