Hello everyone.

I spent some time, but couldn't find such a thread or answers to some questions. I would like to make a discussion about all kinds of itemization or mechanics. Can maintain the thread as a wiki if it grows.
My questions are:

What is the crit cap?
What is the armor cap?
How is damage calculated? (Happyness bonus, boss/elite dmg, different kinds of damage elixir, skull wep procs and so on) Do they all stack or there is a different formula?
What does stacking damage (happyness bonus) mean?

Please provide information how you got to the answers.
Best regards